11.4 The ray model of light

Question 1

Define light

Answer 1

Light is defined as electromagnetic radiation that produces a visual

Question 2

What is a light ray ?

Answer 2

Light Rays: Straight paths that carry light energy.

Question 3

3 Examples of Geometric Optics

Answer 3

Transparent: light can pass through

Translucent: some light can pass through

Opaque: No light can pass through

Question 4

Explain in your own words the terms Normal, Angle of Incidence and Angle of reflection

Answer 4

Normal: Line perpendicular to a surface.

Angle of Incidence: Angle between incoming light ray & normal.

Angle of Reflection: Angle between reflected ray & normal.

Question 5

Label each material as having a specific or diffuse reflection. Justify your answer in each case.
a) Highly waxed floor,

b) Crumpled sheet of aluminum foil

c) Dense carpet.

d) Flat sheet of aluminum foil shiny side up

Answer 5

a) A clean sheet of glass – Transparent
b) A clear, cold winter sky – Transparent
c) Frosted glass – Translucent
d) A brick – Opaque
e) A tree – Opaque
f) Glass of water – Transparent
g) Hazy air – Translucent