Unit 1 Geometric Optics

Question 1

The two laws of reflection

Answer 1

1) the incident ray, the reflected ray and the normal are all in the same plane

2) the angle of incidence is equal to the angle of reflection

Question 2

Refraction

Answer 2

Refraction is the change in direction of a light ray caused by a change in speed when light moves from one optical medium to another

Question 3

Optical density

Answer 3

A measure of the refractive power of a medium. The higher the optical density of the medium, the more the light is refracted or decelerated as it moves through the medium

Question 4

Refractive index

Answer 4

The refractive index is the ratio of the speed of light in air to the speed of light though another medium

Question 5

Normal (N)

Answer 5

This is an imaginary line perpendicular to the surface between two different optical media

Question 6

Angle of incidence (theta i)

Answer 6

The is the angle between the incident ray and the normal surface

Question 7

Angle of refraction (theta r)

Answer 7

This is the angle between the refracted ray and the normal on the surface

Question 8

I’m ii