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Optics and Refraction Quiz

Total questions: 80

Worksheet time: 45mins

Name
Class
Date
1.

What is the phenomenon called when light bends as it passes obliquely from one medium to another?

a)

Reflection

b)

Refraction

c)

Diffraction

d)

Dispersion

2.

Which term refers to the line passing through the center of curvature and the pole of a spherical mirror?

a)

Principal axis

b)

Focal length

c)

Radius of curvature

d)

Focus

3.

Which of the following is an example of a denser medium compared to air?

a)

Vacuum

b)

Water

c)

Hydrogen gas

d)

Helium gas

4.

Which of the following statements is true about the speed of light in different media?

a)

The speed of light in air is less than in water

b)

The speed of light in glass is greater than in air

c)

The speed of light in air is greater than in glass

d)

The speed of light in water is greater than in air

5.

When a ray of light passes from a rarer medium to a denser medium, how does it bend?

a)

It bends away from the normal

b)

It remains undeviated

c)

It bends towards the normal

d)

It reflects back into the rarer medium

6.

What is the ratio of the sine of the angle of incidence to the sine of the angle of refraction called?

a)

Reflection coefficient

b)

Refractive index

c)

Transmission ratio

d)

Absorption constant

7.

No medium can have a refractive index less than:

a)

2

b)

1

c)

0.5

d)

0

8.

Which activity can demonstrate the change in depth due to refraction?

a)

Placing a coin in an empty glass vessel and observing its visibility from different angles.

b)

Heating water in a vessel and measuring its temperature.

c)

Mixing salt in water and observing the taste.

d)

Measuring the weight of the vessel before and after adding water.

9.

What is the phenomenon called when light changes direction as it passes from one transparent medium to another?

a)

Reflection

b)

Diffraction

c)

Refraction

d)

Dispersion

10.

Why does the sun appear above the horizon a few minutes before it actually rises?

a)

Due to reflection of sunlight

b)

Due to refraction of sunlight in the atmosphere

c)

Due to absorption of sunlight by clouds

d)

Due to scattering of sunlight

11.

In a desert, why are the layers of air near the ground rarer than the upper layers during the day?

a)

Because the ground is cooler than the air

b)

Because the sand heats the air near the ground rapidly

c)

Because the air near the ground contains more dust

d)

Because the upper layers are heated by the sun

12.

What happens to a ray of light when it passes from air into glass at an oblique angle to the surface of a prism?

a)

It bends away from the normal

b)

It bends towards the normal

c)

It does not bend

d)

It gets absorbed

13.

What does a prism do to white light?

a)

Produces new colours

b)

Absorbs all colours

c)

Separates existing colours in white light

d)

Reflects only red light

14.

If you perform the activity of passing sunlight through a hole in a cardboard sheet and then through a prism, what will you observe on the screen?

a)

Only red light

b)

A band of seven colours

c)

Only white light

d)

Only blue and green colours

15.

What is the surface called on which silvering is done in a spherical mirror?

a)

Silvered surface

b)

Reflecting surface

c)

Transparent surface

d)

Opaque surface

16.

What are the two kinds of spherical mirrors?

a)

Concave mirror and convex mirror

b)

Plane mirror and convex mirror

c)

Concave mirror and plane mirror

d)

Silvered mirror and plain mirror

17.

Which type of mirror has a real focus?

a)

Concave mirror

b)

Convex mirror

c)

Plane mirror

d)

Parabolic mirror

18.

According to the rules for making ray diagrams for spherical mirrors, where is the object placed?

a)

On the left side of the reflecting surface

b)

On the right side of the reflecting surface

c)

At the center of curvature

d)

At the focus

19.

What is the relationship between the radius of curvature and the focal length of a mirror?

a)

Radius of curvature = 2 × Focal length

b)

Radius of curvature = Focal length / 2

c)

Radius of curvature = Focal length

d)

Radius of curvature = Focal length × 4

20.

When an object is at infinity in front of a concave mirror, what type of image is formed?

a)

Real, inverted, and highly diminished.

b)

Virtual, erect, and magnified.

c)

Real, erect, and magnified.

d)

Virtual, inverted, and highly diminished.

21.

The image formed by a concave mirror is real and inverted when the object is placed beyond the centre of curvature because:

a)

Because the reflected rays actually meet at a point on the same side as the object

b)

Because the mirror is convex

c)

Because the incident rays are parallel to the principal axis

d)

Because the reflected rays appear to diverge from a point behind the mirror

22.

Which type of image is always formed in front of the mirror?

a)

Real image

b)

Virtual image

c)

Magnified image

d)

Diminished image

23.

What is the function of a convex mirror in street lamps?

a)

To focus light on a single point

b)

To diverge light over a wide area

c)

To magnify the light source

d)

To converge light rays

24.

What is the main use of a convex mirror in street lamps?

a)

To focus light on a single spot

b)

To diverge light rays over a large area

c)

To absorb light rays

d)

To create a shadow

25.

Why are convex mirrors used as vigilance mirrors in showrooms and department stores?

a)

They form inverted images

b)

They provide a narrow field of view

c)

They help monitor customers entering and exiting

d)

They absorb light

26.

When a ray of light travels from a rarer to a denser medium, what happens to the ray?

a)

It bends away from the normal

b)

It bends towards the normal

c)

It passes undeviated

d)

It gets absorbed

27.

What happens when a ray of light falls normally on the surface separating two media?

a)

It bends towards the normal

b)

It bends away from the normal

c)

It passes undeviated

d)

It gets reflected

28.

What is the principal axis of a mirror?

a)

The line joining the pole and the centre of curvature

b)

The line joining the focus and the pole

c)

The line joining the pole and the edge of the mirror

d)

The line joining the centre of curvature and the focus

29.

Where is the focus of a concave mirror located?

a)

On the principal axis at which light rays incident parallel to the principal axis meet after reflection

b)

At the centre of curvature

c)

At the pole

d)

At the edge of the mirror

30.

What happens to light when it passes from a denser medium to a rarer medium?

a)

It gets absorbed

b)

It passes undeviated

c)

It bends away from the normal

d)

It bends towards the normal

31.

Which type of mirror is commonly used in rear-view mirrors of vehicles?

a)

Parabolic mirror

b)

Plane mirror

c)

Convex mirror

d)

Concave mirror

32.

What is the effect of increasing the angle of incidence on the angle of refraction when light travels from air to water?

a)

The angle of refraction increases

b)

The angle of refraction remains constant

c)

The angle of refraction decreases

d)

There is no refraction

33.

What is the term for the angle between the incident ray and the normal at the point of incidence?

a)

Angle of reflection

b)

Angle of refraction

c)

Angle of incidence

d)

Critical angle

34.

In which type of mirror is the image always virtual and erect?

a)

Concave mirror

b)

Convex mirror

c)

Plane mirror

d)

All of the above

35.

What is the effect of a prism on the path of light?

a)

It reflects light

b)

It disperses light into its constituent colors

c)

It magnifies light

d)

It absorbs light

36.

What is the term for the bending of light waves around obstacles or through openings?

a)

Diffraction

b)

Dispersion

c)

Refraction

d)

Reflection

37.

Which type of mirror always produces virtual images regardless of the object's position?

a)

Convex mirror

b)

Spherical mirror

c)

Plane mirror

d)

Concave mirror

38.

What is the critical angle in optics?

a)

The angle at which light is completely absorbed

b)

The angle of refraction when light passes from a denser to a rarer medium

c)

The angle at which light travels straight through a medium

d)

The angle of incidence that results in total internal reflection

39.

What type of image is formed by a convex mirror regardless of the object's position?

a)

Virtual and inverted

b)

Real and erect

c)

Virtual and erect

d)

Real and inverted

40.

What is the effect of increasing the angle of incidence on the angle of reflection?

a)

There is no reflection

b)

The angle of reflection increases

c)

The angle of reflection decreases

d)

The angle of reflection remains constant

41.

What is the term for the bending of light as it passes through a prism?

a)

Refraction

b)

Diffraction

c)

Reflection

d)

Dispersion

42.

What is the term for the bending of light as it passes from one medium to another?

a)

Reflection

b)

Refraction

c)

Diffraction

d)

Dispersion

43.

Which type of mirror can produce both real and virtual images depending on the object's position?

a)

Spherical mirror

b)

Plane mirror

c)

Convex mirror

d)

Concave mirror

44.

What is the focal point of a concave mirror?

a)

The point of maximum reflection

b)

The center of curvature

c)

The point where light rays diverge

d)

The point where parallel rays converge

45.

What type of image is formed by a convex mirror when an object is placed at any distance?

a)

Real and inverted

b)

Virtual and inverted

c)

Virtual and erect

d)

Real and erect

46.

Which of the following describes the focal point of a convex mirror?

a)

It is at the edge of the mirror

b)

It is at the surface of the mirror

c)

It is at the center of curvature

d)

It is located behind the mirror

47.

What happens to the speed of light as it moves from air into water?

a)

It becomes zero

b)

It remains constant

c)

It increases

d)

It decreases

48.

What type of image is formed by a concave mirror when the object is placed between the focal point and the mirror?

a)

Virtual and inverted

b)

Real and inverted

c)

Virtual and erect

d)

Real and erect

49.

Which of the following statements is true regarding the focal length of a convex mirror?

a)

It is zero

b)

It is negative

c)

It can be either positive or negative

d)

It is positive

50.

What is the effect of increasing the refractive index of a medium on the speed of light in that medium?

a)

The speed of light becomes zero

b)

The speed of light remains constant

c)

The speed of light decreases

d)

The speed of light increases

51.

What is the phenomenon called when light waves spread out after passing through a narrow opening?

a)

Dispersion

b)

Reflection

c)

Diffraction

d)

Refraction

52.

Which type of mirror can produce both real and virtual images depending on the object's position?

a)

Spherical mirror

b)

Plane mirror

c)

Convex mirror

d)

Concave mirror

53.

What happens to the speed of light as it travels from air into water?

a)

It stops

b)

It remains constant

c)

It decreases

d)

It increases

54.

Light in a vacuum has wavelength, λ. What is the wavelength of light upon entering a material with an index of refraction, n?

a)

nλn\lambda

b)

nλ\frac{n}{\lambda}

c)

ncλ\frac{n}{c\lambda}

d)

λn\frac{\lambda}{n}

55.

Parallel rays of monochromatic light are incident upon two identical diverging lenses before reaching a screen. Which best describes the intensity of the light at point P?

a)

Greater than if there were only one lens

b)

Less than if there were only one lens

c)

Equal to when there is only one lens

d)

Depends upon the focal length of the lens

56.

Specular reflection of Mt. Hood is shown above. Which correctly compares the intensity of incident light (Ii) to the intensity of the reflected light (Ir)?

a)

Ii ≥ IrI_i\ \ge\ I_r

b)

Ii ≤ IrI_{i\ }\le\ I_r

c)

Ii < IrI_i\ <\ I_r

d)

None of the above

57.

What can be determined about the location of the object?

a)

so = f

b)

so > f

c)

so < f

d)

so is undefined

58.

Light passes through a converging lens and forms the image shown in the diagram. Which ray reaches the image plane in the least amount of time?

a)

Ray A

b)

Ray B

c)

Ray C

d)

None of the above

59.
The velocity of light in vacuum is _______ m/s
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
60.
How does light behave as it enters these mediums?
a)
continue its path as straight line.
b)
bends toward the normal
c)
bends away from the normal
d)
reflects
61.
Absolute refractive index of any medium is always _______.
a)
less than 1
b)
greater than 1
c)
1
d)
0
62.
According to the Law of reflection, a light ray striking a mirror
a)
continues moving through the mirror in the same direction
b)
moves into the mirror at a slightly different angle
c)
bounces off the mirror toward the direction it came from
d)
bounces off the mirror at the same angle it hits.
63.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
64.

The image formed by convex lens real, inverted same size as that of the object, the position of the object is

a)

At F1

b)

At 2F1

c)

Beyond 2F1

d)

Between F and 2F1

65.

A ray of light travelling from glass slab to Air, then the refracted ray bends

a)

Towards normal

b)

At normal

c)

Away from the normal

d)

Reflect back to the same medium

66.

3. Refractive index of four medium A, B, C and D are 1.44, 1.50, 1.65 and 1.36 respectively. The velocity of light is minimum in

a)

medium B

b)

medium D

c)

medium C

d)

medium A.

67.

A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:

a)

120 degree

b)

90 degree

c)

45 degree

d)

Zero degree

68.

The refractive index of water is 1.33. The speed of light in water will be

a)

1.33 × 10power of 8 m/s

b)

3 × 10 power of 8 m/s

c)

2.26 × 10 power of 8 m/s

d)

2.66 × 10 power of 8 m/s

69.

Observe diagram, identify P, Q, R

a)

P - angel of emergent, Q – angle of incident , R- angel of refraction

b)

P - angel of refraction, Q – angle of incident , R- angel of emergent

c)

P - angel of emergent, Q – angle of refraction , R- angel of incident

d)

P - angel of incident, Q – angle of refraction , R- angel of emergent

70.

Identify the incident ray and emergent ray from the given figure

a)

Incident ray - OS , emergent ray – ST

b)

Incident ray- AO , emergent ray - OS

c)

Incident ray- AO , emergent ray - ST

d)

Incident ray - ST , emergent ray - AO

71.

If the image formed by lens is diminished in size and erect for all positions of the object what type of lens is this

a)

Convex

b)

Concave

c)

Reflection lens

d)

Plane mirror

72.

The point on the lens through which ray of light passes on un deviated is

a)

Optic centre

b)

Principle focus

c)

Focal length

d)

Aperture

73.

Focal length of convex lens is

a)

Width of the lens

b)

distance between optical centre and principal focus of the lens

c)

the straight lines passing through centre of curvature.

d)

the point where beam of light parallel to principal axis, either converges or diverges after refraction.

74.

Focal length of convex lens is 15 cm, it’s radius of curvature Will be

a)

40 cm

b)

15 cm

c)

30 cm

d)

60 cm

75.

In concave lens, the object is placed beyond 2f1, then the nature of size of the image formed is

a)

Virtual, erect, magnified

b)

Real, inverted, magnified

c)

Virtual, erect, diminished

d)

Real, inverted, diminished

76.

The correct diagram to show formation of image of an object placed between F1 and 2f1 is

a)

a

b)

b

c)

c

d)

d

77.

To obtained magnified, erect image on convex lens, object should be placed

a)

Beyond 2F1

b)

Between F1 and O

c)

At 2F1

d)

Between 2F1 and F1

78.

The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure the path shown is correct?

a)

1

b)

2

c)

3

d)

4

79.

An object is placed at a distance of 0.5 m in front of a plane mirror. The distance between object and image will be:

a)

0.25 m

b)

0.5 m

c)

1.0 m

d)

2.0 m

80.

Mirage is a phenomenon due to:

a)

Refraction of light

b)

Reflection of light

c)

Total internal reflection of light

d)

Diffraction of light

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