Light

Question 1

Law of reflection

Answer 1

I=R

Question 2

Refraction summary

Answer 2

Air to glass. Slows down. Bends towards the normal
Glass to air. Speeds up. Bends away from the normal
Air to water. Slows down. Bends towards the normal
Water to air. Speeds up. Bends away from the normal

Question 3

Refraction of light

Answer 3

Bending of light.
Occurs when light travels from one medium to another.
Speed of the wave changes.

Question 4

Waves travelling from deep water into shallow water

Answer 4

Waves slow down.
Wavelength decreases.
Bends towards the normal.

Question 5

Why a spectrum is produced?

Answer 5

Different colours of light travel at different speeds in the glass.

Question 6

When does total internal reflection happen?

Answer 6

Angle of incidence is greater than critical angle.

Question 7

What are the 2 types of lenses?

Answer 7

Converging-convex
Diverging- concave

Question 8

What are some possible properties of an image?

Answer 8

Real.
Virtual.
Magnified.
Diminished.
Upright.
Inverted.

Question 9

What lens is needed for short sight?
Causes of short sight?
How is vision affected?

Answer 9

Concave.
Eyeball grows slightly too long.

Question 10

What lens is needed for long sight?
Causes of long sight?
How is vision affected?

Answer 10

Convex.
Eyeball is too short or lens cannot be made thick enough to focus on the rays of light on the retina.
Nearby objects appear blurred.