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Light & Reflection

Total questions: 46

Worksheet time: 2hrs 18mins

Name
Class
Date
1.

which of the following is not a property of the image formed by a [lane mirror?

a)

virtual and erect

b)

Object size = image size

c)

object distance = image distance

d)

Real and inverted

2.

Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the above figure.

The correct way of measuring accurate focal length of the mirror is

a)

A

b)

B

c)

C

d)

D

3.

which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in the figure 10.6?

a)

A

b)

B

c)

C

d)

D

4.

Convex mirror is also called as

a)

converging mirror

b)

diverging mirror

c)

plane mirror

d)

silver mirror

5.

The relation between focal length and radius of curvature is

a)

R = 2f

b)

1/f = 2R

c)

f = R/2

d)

R = 2/f

6.

The focal length of a plane mirror is ........

a)

infinite

b)

zero

c)

1m

d)

100m

7.

A convex mirror has a focal length 12 cm. Then its radius of curvature is ........ cm

a)

24

b)

12

c)

6

d)

1.2

8.

When the object is in between the centre of curvature (C) and focus (F) of a concave mirror, then the position of the image is ...........

a)

At focus

b)

At the centre of curvature

c)

at infinity

d)

beyond the centre of curvature

9.

Which of the following characteristic of an image formed for a convex mirror?

a)

Enlarged size

b)

virtual image

c)

Real image

d)

inverted image

10.

Which mirror is shown in the figure?

a)

convex mirror

b)

concave mirror

c)

plane mirror

d)

silver mirror

11.

Mirror formula is defined as ........

a)

A

b)

B

c)

C

d)

D

12.

When the object is at infinity, a point sized image is formed at ................ by the convex mirror

a)

focus behind the mirror

b)

focus in front of the mirror

c)

radius of curvature

d)

principal axis

13.

According to laws of reflection,

a)

angle of incidence > angle of reflection

b)

angle of incidence < angle of reflection

c)

angle of incidence = angle of reflection

d)

both 1 and 2

14.

Where will be the images of the Sun or the moon are formed by a concave mirror?

a)

Focus

b)

Pole

c)

centre of curvature

d)

beyond centre of curvature

15.

What is the size of the image formed when an object is kept at the focus in front of concave mirror?

a)

enlarged

b)

diminished

c)

highly enlarged

d)

highly diminished

16.
The imaginary line perpendicular to a reflecting surface is called _____.
a)
crooked line
b)
parallel line
c)
angular line
d)
normal line
17.
Why can you see most objects? 
a)
they emit light
b)
light refracts through them
c)
light reflects off them
d)
They absorb light
18.

Images in a plane mirror are

a)

real

b)

larger

c)

same size

d)

smaller

19.

What is an image called that forms when light rays actually converge

a)

virtual image

b)

real image

c)

imaginary image

d)

Spectral

20.

In the image, all the rays meet at F, What is F

a)

focal length

b)

focal point

c)

center of curvature

d)

reflection

21.
Convex Mirrors produce...
a)
only virtual images
b)
virtual or real images
c)
only real images
d)
inverted images
22.
Which terms describe the reflection seen in this image?
a)
virtual, upright
b)
virtual, inverted
c)
real, upright
d)
real, inverted
23.

When distance of object from a mirror is gradually increased then image formed by it becomes inverted which was erect in the beginning. Which type of mirror is this ?

a)

Plane mirror

b)

Concave mirror

c)

Convex mirror

d)

none of the above

24.

Which mirror is used as a make-up mirror ?

a)

Convex mirror

b)

plane mirror

c)

concave mirror

d)

plano-concave

25.

What shall be the position of image , if an object is place in-front of a concave mirror as shown ?

a)

At C

b)

between F & C

c)

between F & P

d)

at F

26.
An object is placed 10 cm from a convex mirror. Its image is formed 5 cm behind the mirror.The focal length of the given convex mirror is
a)
-5 cm
b)
5 cm
c)
10 cm
d)
-10cm
27.
A real image having a size of 10 cm is formed by a concave mirror. The size of the object is 5 cm.The magnification of the object is
a)
-5
b)
5
c)
2
d)
-2
28.

An object is placed 20 cm from a concave mirror with a focal point of 15 cm. Where will the image be located.

a)

15 cm

b)

20 cm`

c)

60 cm

d)

-8.6 cm

29.

An object is placed 20 cm from a convex mirror with a focal point of 15 cm. Where will the image be located.

a)

-15 cm

b)

-20 cm`

c)

60 cm

d)

-8.6 cm

30.

An image is formed upside down in front of mirror and seems bigger by 2 times from the actual size. What might be the type of mirror uses?

a)

concave mirror

b)

convex mirror

c)

plane mirror

d)

concave lens

31.

Who was the first to develop reflecting telescopes?

a)

Nicolaus Copernicus

b)

Isaac Newton

c)

Galileo Galilei

d)

Hubble

32.

Modern telescopes are reflecting because: (Choose all that apply)

a)

Lenses are difficult to manufacture

b)

Lenses are heavy and fragile

c)

lenses reflect light that passes through them

d)

Lenses require only 1 perfect surface

33.

What particles make up light?

a)

Photons

b)

Neutrons

c)

Protons

d)

Lumitrons

34.

Light behaves like both a particle and a ______.

a)

Mass

b)

Wave

c)

Current

d)

Proton

35.
A light year is...
a)
The speed light travels
b)
How long it takes light to get to you from the sun
c)
The distance light can travel in a year
d)
How many years it takes light to be emitted
36.
Smooth surfaces _______ a lot of light.
a)
reflect
b)
bend
c)
absorb
d)
twist
37.
Why do we see objects as white?
a)
They absorb all light
b)
They reflect all light
c)
They absorb some light and reflect some light
38.
If you are wearing a yellow shirt, what is true of the light that strikes it?
a)
Yellow is absorbed; everything else is reflected
b)
Yellow is reflected; everything else is absorbed
c)
All colors are reflected
d)
All colors are absorbed
39.

Which color has the lowest frequency?

a)

yellow

b)

green

c)

blue

d)

indigo

40.

Which of the following has the longest wavelength?

a)

Infrared

b)

The color Indigo

c)

gamma rays

d)

TV

41.

Which of the following has the shortest wavelength?

a)

Gamma rays

b)

The color blue

c)

AM radio

d)

Infrared

42.

Which of the following has the highest frequency?

a)

TV

b)

Microwaves

c)

the color indigo

d)

ultraviolet rays

43.

What do radio waves, microwaves, X-rays, and gamma rays all have in common?

a)

They all have the same wavelength.

b)

They are electromagnetic waves.

c)

They are detected in the same way.

d)

They store the same amount of energy.

44.

A wave has a frequency of 2.5 hz and a wavelength of 20 m. What is the velocity of the wave?

a)

50 m/s

b)

8 m/s

c)

40 m/s

45.

A beam of light has a wavelength of 600 nm in air. What is the frequency of the light (c = 3x108 m/s)?

a)

5 x 1014 Hz

b)

2 x 1014 Hz

c)

3 x 1014 Hz

d)

6 x 1014 Hz

46.

Find the distance a radio wave will travel in 0.250 s.

a)

7.50 × 107 m

b)

5.60 × 107 m

c)

1.20 × 109 m

d)

1.35 × 109 m

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