Chapter 7 - Reflection

Question 1

What are luminous objects?

Answer 1

Objects that give off their own light and can be seen directly

Question 2

Examples of luminous objects

Answer 2

Sun, lamps

Question 3

What are non-luminous objects?

Answer 3

Objects that do not give off light of their own and are seen when they reflect light from a source

Question 4

Light rays undergo ________ when incident on a smooth flat surface

Answer 4

regular reflection

Question 5

Light rays ________ when incident on a rough surface

Answer 5

diffuse reflection

Question 6

State the laws of reflection

Answer 6

• The incident ray, the reflected ray, and the normal at the point of incidence all lie on the same plane
• The angle of incidence, i, is equal to the angle of reflection, r (i = r)

Question 7

What are the properties of a plane mirror images?

Answer 7

1. virtual
2. upright
3. the same size as the object
4. the same distance behind the mirror as the object is in front of the mirror
5. laterally-inverted

Question 8

To see a large object in a mirror, the mirror must be large enough such that…

Answer 8

light rays from the furthest edges of the object can reflect off the mirror to get to the eye

Question 9

What is the angle of deviation θ of a light ray?

Answer 9

The angle between its incident direction and its reflected direction