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LIGHT- REFLECTION AND REFRACTION

Total questions: 40

Worksheet time: 26mins

Name
Class
Date
1.

When light hits an area and bounces back it is called:

a)

echo

b)

refraction

c)

reflection

d)

absorbing

2.

When light goes from one material(medium) to another it becomes bent, what term means bent?

a)

reflected

b)

refracted

c)

absorbed

d)

turned

3.

Why does the straw appear to be bent?

a)

light is reflected

b)

light is absorbed

c)

light is turned

d)

light is refracted

4.

When light passes from air to water, what happens to the speed of the light?

a)

speeds up

b)

slows down

c)

stays the same

5.

What is happening in this picture?

a)

Reflection

b)

Refraction

6.
The velocity of light in vacuum is _______ m/s
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
7.

What is the angle of reflection (θr) in the image?

a)

56o

b)

90o

c)

124o

d)

34o

8.
A student placed a pencil in a cup of water.  The pencil appears broken because light-
a)
always travels in a straight line
b)
bends when it passes through water
c)
makes the water in the glass evaporate
d)
reflects the pencil on the water's surface
9.

Which of the following characteristics are correct for the image formed in a plane mirror?


I. Upright

II. Inverted

III. Real

IV. Same size as the object

V. Virtual

a)

I, II, III

b)

I, III, IV

c)

I, IV, V

d)

III, IV, V

10.
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
11.

Which figure represents the path light takes through a converging lens?

a)
b)
c)
d)
12.

The type of mirror used in reflector in automobile lights is

a)

Plane mirror

b)

Concave mirror

c)

Convex mirror

d)

None of the above

13.

A mirror having focal length –15 cm is _________________

a)

Plane mirror

b)

Concave mirror

c)

Convex mirror

d)

None of these

14.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
15.
How is light affected by an increase in the index of refraction?
a)
Its frequency increases
b)
Its frequency decreases
c)
Its speed increases
d)
Its speed decreases
16.

Tick the correct of TWO devices which use the principle of light reflection in our daily lives.

a)
b)
c)
d)
17.
Why does the lower part of the child appear so much different in size from the upper part?
a)
The light rays that travel through water and then into air are refracted.
b)
The light rays that travel through water and then into air are enlarged.
c)
The light rays that travel through air and then into water are reflected.
d)
The light rays that travel through air and then into water are reduced.
18.

What might explain why light travels in a straight line?

a)

If there is nothing to interfere with light waves, they should travel in a straight line.

b)

Light waves will always travel in a straight line, even if they come into contact with another object.

c)

Light waves don't travel in a straight line.

d)

Light waves travel in a straight line because sound waves travel in a straight line.

19.
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.
20.
Density is...
a)
the amount of mass in an object
b)
the amount of space an object takes up
c)
the amount of mass in a given space
d)
the weight of an object
21.

The line 90 degress through the refracting or reflecting surface is called?

a)

Medium

b)

Normal

c)

Incidence

d)

Reflection

22.
The pictures shows what a student observed when he looked through a hand lens at a penny.
What happens to light passing through a hand lens that makes the image of the penny appear larger? The light is-
a)
absorbed
b)
reflected
c)
refracted
d)
stopped
23.
What three things may happen to light that strikes an object? 
a)
The light may be reflected, transmitted or absorbed.
b)
The light may be reflected and refracted.
c)
The light may be absorbed and transmitted.
24.

The law of reflection states that

a)

Angle of incidence = Angle of reflection

b)

Angle of incidence = Angle of incidence

c)

Angle of reflection = Angle of translucence

d)

Angle of reflection = Angle of reflection

25.

Objects that reflect well are

a)

Matte surfaces

b)

Smooth, shiny surfaces

c)

Dark coloured surfaces

d)

Medium coloured surfaces

26.

A concave mirror

a)

Curves inwards

b)

Curves outwards

c)

Curves sideways

d)

Curves in multiple directions

27.

What is the relation between radius of curvature R and focal length f of a mirror ?

a)

R = 2f

b)

R=2/f

c)

R=1/2f

d)

f=2R

28.

What is the mirror formula ?

a)

1/f = 1/v + 1/u

b)

1/f = 1/u -1/v

c)

1/u = 1/f + 1/v

d)

1/f = u + v

29.

An object is placed at the centre of curvature of a concave mirror.The distance between the object and its image is

a)

Equal to f

b)

Equal to 2f

c)

Zero

d)

Equal to 4f

30.

An object is placed at a distance of 10cm from a convex mirror of focal length 15cm.find the position and nature of the image

a)

v = -6cm, real & inverted

b)

v = -3cm , real & inverted

c)

v = +6cm , virtual & erect

d)

v = +15cm ,virtual & erect

31.

We get a virtual image with a concave mirror when the object is placed between

a)

Pole and Focus

b)

Focus and Centre of curvature

c)

On centre of curvature

d)

Beyond centre of curvature

32.

The magnification is always 1 for the following mirror

a)

Convex Mirror

b)

Concave Mirror

c)

Plane Mirror

d)

None of these

33.

The mirror for which the magnification is always less than 1

a)

Convex Mirror

b)

Concave Mirror

c)

Plane Mirror

d)

None of these

34.

A concave mirror forms a point sized image for a object at

a)

Focus

b)

Infinity

c)

Beyond centre of curvature

d)

Centre of curvature

35.

Which of the following mirrors is used by Archimedes to burn the ships?

a)

Bi-concave

b)

Bi-convex

c)

Concave

d)

Convex

36.

Where is the object placed in front of concave mirror to get virtual image?

a)

Between mirror and F

b)

On focal point

c)

Between F and C

d)

On C

37.

A concave mirror has a focal length of 25 cm. A person wants to see his face in this mirror. At what distance should the person stand?

a)

40 cm

b)

30 cm

c)

20 cm

d)

25 cm

38.

To get an image larger than the object, one can use

a)

Convex mirror

b)

Concave mirror

c)

Plane mirror

d)

Both Convex and Concave mirror

39.

Magnification has a plus sign, then the image is

a)

Virtual and erect

b)

Real and erect

c)

Real and inverted

d)

At infinity

40.

When parallel rays are incident on a concave mirror on reflection they meet at the

a)

Pole

b)

Radius of curvature

c)

Focus

d)

None of these

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