Light

Question 1

Law of reflection

Answer 1

Angle incidence = Angle of reflection

Question 2

Where and when does reflection occur

Answer 2

• in mirrors (flat or curved)
• In a glass prism box
• Reflection can only occur (if angle of incidence is greater than the critical angle)

Question 3

What happens when light goes from somewhere off high density to low density

Answer 3

• The light changes direction (light speeds up)
• light moves away from the normal line
• This is refraction

Question 4

What happens when light travels from low density to high density

Answer 4

• light slows down (changes direction)
• light moves towards the normal line
• this is refraction

Question 5

What is the equation to find the refractive index

Answer 5

• n = sin i / sin r

Question 6

What is the equation to find the critical angle

Answer 6

• n = 1 / sin c

Question 7

Define what is meant by the term critical angle

Answer 7

• The critical angle is — the maximum angle of incidence at which the angle of refraction = 90 degrees

Question 8

What is the critical angle in glass

Answer 8

• 45 degrees

Question 9

CORE PRACTICAL (light topic)

Answer 9

• Don’t have notes got to learn by paper

Question 10

Light waves are transverse what does this mean?

Answer 10

Transverse waves can be…..

• reflected and refracted

Question 11

What doe ‘TIR’ stand for

Answer 11

• Total internal reflection

Question 12

What is Total internal reflection

Answer 12

• the light reflects internally
• after the last possible angle of refraction. (Look in book)