Lecture 2 - Refraction

Question 1

What is refraction?

Answer 1

When light travels through a different medium it can either speed up or slow down

Question 2

What happens when light travels from glass to air?

Answer 2

It speeds up and moves away from the normal

The angle of refraction is bigger than the angle of incidence

Question 3

What happens when light travels from air to glass?

Answer 3

It slows down and moves towards the normal

The angle of refraction is smaller than the angle of incidence

Question 4

What happens when the light travels through a thick lens?

Answer 4

so when the wavefront passes through the lens it gets slower and forms a spherical wavefront

Question 5

When measuring from the refractive surface to object what is the value?

Answer 5

negative

Question 6

Define object distance

Answer 6

the distance of the object from the lens axis

Question 7

Define image distance

Answer 7

the distance of the image from the lens axis

Question 8

What is l’

Answer 8

image distance

Question 9

what is l

Answer 9

object distance

Question 10

What is the focal length

Answer 10

distance between the focal point ad lens

Question 11

What is the focal point

Answer 11

the point on the optical axis where rays meet