Light

Question 1

Movement of light

Answer 1

Light bends towards the normal as it slows and the converse

Question 2

Dispersion

Answer 2

When a spectrum of different colours is created because different colours travel at different speeds in the glass, the greater the amount of refraction the greater the change of speed, red is refracted the least as it is slowed the least and violet is refracted the most as it is slowed the most

Question 3

Angle of incidence and reflection

Answer 3

Measured from a line at right angles to the mirror known as the normal and are equal to each other

Question 4

How does refraction effect speed

Answer 4

The greater the refraction the greater the change of speed

Question 5

Critical angle

Answer 5

When the angle of incidence in the glass reaches the critical angle, the angle of reflection in the air will be 90 degrees

When the angle of incidence in the glass is greater than the critical angle, total internal reflection occurs

Question 6

Short sight vs long sight

Answer 6

Short sighted people’s eyes grow too long so the focal point is in front of the retina

Long sighted people’s eyes grow too short so the focal point is behind the retina