Lesson on Light Waves

Random Quest

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Match

Match the following

Reflection

Refraction

Diffraction

Transversal

Longitudinal

• Reflection

• Refraction

• Diffraction

• Transversal

• Longitudinal

Multiple Choice

How can we see non luminous objects?

• By reflecting light off of them
• By using infrared technology
• By emitting light themselves
• By absorbing light from the surroundings

​Random Quest (1 dojo)... Raise ur hand!

Multiple Choice

In the given figure at which of the points A to E will the observer see the image in the plane mirror of the object?

• A

• B

• C

• D

• E

Multiple Choice

Given figure shows the image in a plane mirror of a clock. The correct time is

• 2.25

• 2.35

• 6.45

• 9.25

Multiple Choice

From the diagram shown, what is the angle of reflection?

• 20^o

• 40^o

• 70^o

• 90^o

Multiple Choice

Which of the following demonstrates the law of reflection?

• A

• B

• C

• D

Multiple Choice

An incident ray strikes a plane mirror at an angle of incidence of 40^o. What is the decrease in the angle of reflection if the incidence ray moves to an angle of incidence of 30^o?

• 10^o

• 20^o

• 30^o

• 40^o

Multiple Choice

A plane mirror is inclined at 40o to the floor. An incident ray parallel to the floor strikes the mirror and a reflected ray is formed. What is the angle of reflection?

• 20^o

• 40^o

• 50^o

• 80^o

Multiple Choice

Which of the following are the properties of a plane mirror image?

1. The image is the same size as the object.

2. The image is virtual.

3. The image is inverted.

• 1

• 1 and 2

• 1 and 3

• 1, 2, and 3

Multiple Choice

Which of the following is the mirror image of the word "EXAMPLE" when it is placed facing the plane mirror?

• A

• B

• C

• D

Multiple Choice

A wave travels from shallow to deep water. What happens to the frequency and the wavelength of the wave?

• frequency increases, wavelength increases

• frequency decreases, wavelength decreases

• frequency unchanged, wavelength increases

• frequency unchanged, wavelength decreases

Multiple Choice

How does light behave as it enters these mediums?

• continue its path as straight line.
• bends toward the normal
• bends away from the normal
• reflects

Multiple Choice

Why does the straw appear to be bent?

• light is reflected

• light is absorbed

• light is turned

• light is refracted

Multiple Choice

The formula to calculate the refractive index is

• n=cv
• n=v/c
• n=c/v
• v=nc

Multiple Choice

What is the index of refraction of a refractive liquid if the angle of incidence in the air is 35 degrees and the angle of refraction is 14 degrees?

• 1.33
• 2.21
• 2.37
• 1.72

Multiple Choice

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

• diamond
• water
• flint glass
• barium glass

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