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Optics

Total questions: 45

Worksheet time: 4hrs 45mins

Name
Class
Date
1.

This ray diagram is for which mirror?

a)

concave

b)

convex

c)

plane

d)

window

2.
The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-
a)
absorbed
b)
stopped
c)
reflected
d)
refracted
3.
Which terms describe the reflection seen in this image?
a)
virtual, upright
b)
virtual, inverted
c)
real, upright
d)
real, inverted
4.

In the diagram, which letter represents the angle of incidence?

a)

A

b)

B

c)

C

d)

D

5.

Which diagram represents specular reflection?

a)

A

b)

B

6.
Law of reflection state that - The angle of incidence is .................. to the angle of reflection.
a)
equal
b)
double
c)
half
7.

Which diagram represents diffuse reflection?

a)

A

b)

B

c)

C

d)

D

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 due to traveling at a different speed 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 describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?
a)
total internal reflection
b)
total external transmission
c)
partial reflection, partial transmission
d)
partial reflection, total transmission
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.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
12.

What direction will this light ray bend after it is refracted?

a)
b)
c)
d)
13.

The image as seen through this convex lens will be ...

a)

real and larger

b)

real and smaller

c)

virtual and larger

d)

virtual and smaller

14.

When light goes from glass into water, the speed of the light...

a)

slows down

b)

stays the same

c)

speeds up

15.

What direction will this light ray refract?

a)
b)
c)
d)
16.

The image will ...

a)

be upright and real

b)

be upright and virtual

c)

not exist

d)

be upside down and real

17.

What type of lens is being used here?

a)

convex

b)

concave

18.

You need a lens for a movie project. Its best to use a _____ lens because only a ______ image will project on the screen.

a)

convex, real

b)

convex, virtual

c)

concave, real

d)

concave, virtual

19.

What material could the upper layer be?

a)

Water

b)

Boron Nitrate

c)

Cubic Zirconia

d)

Diamond

20.

What material could the lower layer be?

a)

air

b)

water

c)

Boron Nitrate

d)

Diamond

21.

The color you see is the color that is ___________

a)

reflected

b)

absorbed

22.

The wavelength from red to violet is __________________.

a)

decreasing

b)

increasing

c)

the same

23.

If a material absorbs all frequencies of light waves EXCEPT green, what color will be perceived by the observer?

a)

Black

b)

Green

c)

White

d)

Yellow

24.

Which has the greatest energy among the colors in a rainbow?

a)

green

b)

orange

c)

red

d)

violet

25.

Why does white light separate into different colors as it passes through a prism?

a)

The colors are changed by addition.

b)

This is an example of color by subtraction.

c)

Different colored light has different wavelengths.

d)

The side part of a prism only let certain colors of light pass through.

26.

Which of the following is true about the relationship between frequency and energy?

a)

The frequency of the color of light and energy are not related.

b)

As the frequency of the color of light increases, its energy decreases.

c)

As the frequency of the color of light decreases, the energy increases.

d)

As the frequency of the color of light increases, the energy also increases.

27.

The sky is blue because...

a)

blue is the color most scattered or reflected by our atmosphere.

b)

red is the color most scattered or reflected by our atmosphere.

c)

blue is the color most absorbed by our atmosphere.

d)

blue is complimentary to orange.

28.

What does "c" stand for in the equation for a wave?

a)

The speed of an electron

b)

The crest

c)

The speed of light

d)

The frequency

29.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

dual

b)

wave

c)

particle

d)

electromagnetic

30.

Which of the following colors of light have the highest energy

a)

red

b)

orange

c)

green

d)

purple

31.

If light travels from a higher to a lower index of refraction medium the light will

a)

bend away from the vertical axis or may not refract

b)

bend closer to the vertical axis

c)

not bend

d)

answer is not here

32.

Light travels from air (n = 1.000) into an optical fiber. If the angles of incidence and refraction are 22oand 15º respectively. what is the index of refraction inside the fiber? Round off your values to 3 sig. figs.

HINT: n1sin⁡θ1=n2sin⁡θ2HINT:\ n_1\sin\theta_1=n_2\sin\theta_2

a)

1.45

b)

1.44

c)

0.69

d)

0.70

33.

The index of refraction, is defined as the ratio of the speed of light in a vacuum (c = 3x10^8 m/s) to the speed of light in a medium. What is the index of refraction of a medium where the speed of light is 0.7c ? Round off your values to 3 sig. figs.

a)

1.42

b)

1.43

c)

1.28

d)

1.29

34.

Light travels from air (n = 1.00) into a second material. The incident ray of light hits the surface at angle of 64o and the refracted ray enters the second material at an angle of 32o. What is the index of refraction of the second material? n1sin(Θ1) = n2sin(Θ2)

a)

1.4

b)

0.90

c)

0.53

d)

1.7

35.
The do will be a _________________ value.
a)
positive
b)
negative
36.
The di for a real image will be a _________________ value
a)
positive
b)
negative
37.
The di for a virtual image will have a ______ value.
a)
positive
b)
negative
38.
The value for f is negative in this diagram.
a)
True
b)
False
39.

A tree 20 m high is located 40 m from the converging lens of focal length 0.08 m.Calculate the distance from the lens to the image.

a)

0.08 m

b)

0.01 m

c)

0.10 m

d)

0.20 m

40.

Which lens represents the path light takes through a diverging lens?

a)
b)
c)
d)
41.

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

a)
b)
c)
d)
42.
A converging lens produces an image twice the size of the original. If the object is placed 0.40 m from the lens, and the image produced is 0.80 m from the lens. What is the focal length of the lens? 
a)
0.351 m
b)
0.267 m
c)
0.416 m
d)
0.112 m
43.

You place an object 20 cm in front of a convex mirror with a –15 cm focal length. Calculate the image position

HINT. Use the mirror equation: 1f=1di+1doHINT.\ Use\ the\ mirror\ equation:\ \frac{1}{f}=\frac{1}{d_i}+\frac{1}{d_o}  

a)

9.45 cm

b)

5.34 cm

c)

-4.35 cm

d)

-8.57 cm

44.

If the flame on the candle is 2 cm tall, how tall is the flame of the image?

a)

1

b)

2

c)

4

d)

8

45.

A concave mirror has a radius of curvature of 24 cm. A 6.4 cm tall object is held 26cm from the mirror. Calculate the distance between the image and the mirror.

HINTS. use: f=C2        di=fdodo−f     1do+1di=1fHINTS.\ use:\ f=\frac{C}{2}\ \ \ \ \ \ \ \ d_i=\frac{fd_o}{d_o-f}\ \ \ \ \ \frac{1}{d_o}+\frac{1}{d_i}=\frac{1}{f}  

a)

22.3 cm

b)

23.2 cm

c)

32.2 cm

d)

23.3 cm

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