Questions Lesson 3

A incident ray hits a plane mirror at an angle of 30° . What will be the angle of the reflected ray?

30°
60°
90°
none

If the angle between an incident ray and its reflected ray is q , what is the measure of the angle of reflection?

q
q /2
3q /2
q /4

What is the measure of the critical angle for a diamond. Assume that light is entering from air to the diamond. (Air has an index of refraction of 1, and Diamond has an index of refraction of 2.42)

90
24
24.4
28.5

A certain glass (n = 1.61) has a critical angle of 52° when a light ray passes from a certain substance into it. What is the index of refraction of this glass?

1.36
1.47
.53
1.27

An irregular surface will cause:

diffuse reflection
regular reflection
glare
dispersion

A light ray is shone on a plane mirror. As the angle of incidence increases, the angle of reflection:

Can't know
Decreases
Remains the Same
Increases

Regular reflection can cause:

clear images
readable images
glare
refraction

An incident ray enters a tub of Corn oil (n = 1.47) from Air (n = 1) at an angle of 31° . What is the angle of refraction?

15.2°
20.5°
17.8°
25.3°

What is the speed of light in water if the index of refraction of water is 1.33, and the speed of light in a vacuum is 3 ´ 10⁸ m/s?

4 x10^⁸ m/s
2.56 x10^{^8} m/s
2.26 x10^⁸ m/s
1.38 x10^⁸ m/s

An incident ray is traveling from Lucite at an angle of 30° into an unknown substance. The angle of refraction is measured to be 45° . What is the index of refraction for this substance?

1.47
1.53
2.29
1.06

Count your correct answers

If you had less than 7 you should repeat this lesson

If you had 7 or more, you can go to the next lesson