Reflection and Colours

Question 1

2 ray models of light

Answer 1

1. Point source (all light originates from a single point)
2. Parallel bundle (distant object, or laser beam)

Question 2

What are the 2 things stated in the law of reflection?

Answer 2

1. Incident ray, reflected ray and normal lie on the same plane
2. angle of incidence = angle of reflection

Question 3

What are the 2 types of reflection?

Answer 3

1. Specular reflection
2. Diffuse reflection

Question 4

Properties of a mirror image?

Answer 4

1. upright
2. same size
3. image distance = object distance
4. laterally inverted
5. virtual

6. an image formed by one surface can serve as the object for another surface.

Question 5

FYI

What is the minimum height of the mirror such that the whole body is seen?

Answer 5

h/2

h is the height of the person

Question 6

Uses of plane mirrors?

Answer 6

1. Optical testing
2. Instrument scales
3. Periscope
4. Overhead projectors

Question 7

What does a blue object do?

Answer 7

Absorbs every colour except blue which it reflects

Question 8

What does a blue filter do?

Answer 8

Absorbs all colours except blue which it allows to pass through

Question 9

What is the name given to 2 colours that form white?

Answer 9

Complementary colours

Question 10

Colour Addition Table

Answer 10

R + G + B = W
R + G = Y
R + B = M
B + G = C