Chapter 10 - Reflection and Refraction of light

Question 1

Where is the angle of incidence on a graph?

Answer 1

Between the incident ray and the normal

Question 2

State the law of reflection

Answer 2

Angle I = Angle R

Question 3

Describe the image formed by a plane mirror

Answer 3

Virtual, upright, laterally inverted

Question 4

Define refraction

Answer 4

Change in direction of waves when they travel across a boundary from one medium to another

Question 5

What happens angle i and angle r when a light ray refracts from air into glass?

Answer 5

Angle r is less than angle i

Question 6

What happens angle i and angle r when a light ray refracts from glass into air?

Answer 6

Angle r is greater than angle i

Question 7

What does n show?

Answer 7

How much a medium can refract a light ray

Question 8

What is always true about the angle of incidence and the angle of refraction?

Answer 8

Angle i is always greater than angle r

Question 9

What happens to the angle of refraction as the angle of incidence increases?

Answer 9

Angle r increases

Question 10

When does the critical angle occur?

Answer 10

When angle i hits a surface at an angle which produces angle r along the boundary

Question 11

When does TIR occur?

Answer 11

When angle of incidence is greater than the critical angle

Question 12

How does an endoscope see the body directly?

Answer 12

Using TIR