Waves 4; Reflection and Rarefaction

What is the angle of reflection?

• 50

• 45

• 55

• 40

Calculate the angle of Reflection

• 54

• 34

• 44

• 64

Calculate the angle of Incidence

• 54

• 34

• 44

• 64

Why does the pencil appear bent?

• Light rays travelling from parts of the pencil above the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil above the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil under the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil under the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

A semi-circular block of glass is immersed in a clear liquid of refractive index 1.25. The refractive index of the glass is 1.52.

Determine the speed of light in the glass.

• $1.97\times10^8$

• $2\times10^8$

• 0.506

• $5.06\times10^{-7}$

The velocity of light in vacuum is _______ m/s

• 3x10⁸
• 3x10¹²
• 3x10⁶
• 3x10¹⁰

Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45

• diamond
• water
• flint glass
• barium glass

Light travels through a liquid at   $2.25\times10^8$  m/s. What is the index of the liquid?

• 1.33

• 1.0

• 1.523

• 2.45

What is the index of refraction of a refractive liquid if the angle of incidence in the air is 35 degrees and the angle of refraction is 14 degrees?

• 1.33
• 2.21
• 2.37
• 1.72