Light enters an optical fiber at an angle of incidence of 15 ∘ . On a copy of this drawing, draw a line to show how the path of the light continues down the fiber.

The ray of light entering in the fiber is totally internally reflected every time as it strikes the interface of the two media. It follows the laws of reflection every time as it gets reflected. The reflected ray and the incident ray forms the equal angle with the normal drawn at the point of incidence. The path of light is shown in the figure below:

E M B I B E

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Refraction of sound>Q 1

EASY

MYP:4-5

IMPORTANT

Earn 100

If sound waves speed up, will they bend toward the normal or away from it?

Important Questions on Development

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Refraction of sound>Q 2

On a copy of the diagram, continue the lines showing the direction of the sound waves.

Question Image

EASY

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Exercise 7>Q 1

Glass has a refractive index of

1.5

. Calculate the critical angle for this material.

EASY

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Exercise 7>Q 2

What would be the refractive index of a material have to be in order to have a critical angle of

30 °

?

EASY

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Exercise 7>Q 3

Why doesn't total internal reflection occur when light travels from air into water?

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Exercise 7>Q 4

Sound waves speed up when they enter water. In air, the speed is about

330 m s^{- 1}

, but in water the sound waves travel at about

1500 m s^{- 1}

. Explain whether total internal reflection will occur when sound travels from air into water and from water into air. Explain how this affects how well you can hear sounds above the surface of the water if you are under the surface.

EASY

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 9 - Development>Exercise 8>Q 1

A tennis player can serve a tennis ball at