Unit 3 - Lesson 5: Refraction

Question 1

What must waves be in to travel at different speed?

Answer 1

Waves travel at different speeds in substances with different densities.

Question 2

Do transverse waves, like EM radiation, move slower or faster in denser material?

Answer 2

Transverse waves, like EM radiation, move slower in denser material.

Question 3

Do longitudinal waves, like sound, move slower or faster in denser material?

Answer 3

Longitudinal waves, like sound, move faster in denser material.

Question 4

What are the requirements for a wave to be refracted?

Answer 4

A wave is only refracted if it changes direction at the boundary to the material it enters.

https://i.pinimg.com/736x/21/85/15/2185155bfcf96bd621027face6d25a5e.jpg

Question 5

What type of waves can ray diagrams be drawn for?

Answer 5

Reflected and refracted waves.

Question 6

What is the method for drawing a refracted ray diagram?

Answer 6

1. Draw the boundary line between your two materials.
2. Add a normal.
3. Draw an incident ray that meets the normal at the boundary line.
4. Measure the angle of incidence.
5. Draw the refracted ray. If the material gets denser, bend it towards the normal. If the material gets less dense, bend it away from the normal.
6. Draw the angle of refraction.

https://i.pinimg.com/736x/07/ad/7f/07ad7fe4a69000cb752a9acb3489ccd4.jpg

Question 7

What can rays be refracted twice through?

Answer 7

Rectangular glass blocks.

Question 8

What three rays are shown when a ray is refracted twice through a rectangular glass block?

Answer 8

Incident ray
Refracted ray
Emergent ray

Question 9

Provide a diagram of a ray being refracted twice through a rectangular glass block.

Answer 9

https://i.pinimg.com/736x/8f/6b/da/8f6bda065e04d52b6e68d9dbff10e486.jpg

Question 10

Finish the sentences:
Stars twinkle due to the (a) of their light through the Earth’s atmosphere. The atmosphere generally (b) in density closer to Earth. Light, a (c) wave, slows down in denser substances. It will move (d) the normal.

Answer 10

(a) refraction
(b) increases
(c) transverse
(d) towards

Question 11

Microwaves move slower in denser material. True or false.

Answer 11

True

Question 12

Sound waves move slower in denser material. True or false.

Answer 12

False. (Sound waves move faster in denser material)

Question 13

Light is a longitudinal wave. True or false.

Answer 13

False. Light is a transverse wave.

Question 14

What phrase best describes this image?

https://i.pinimg.com/736x/b6/43/5e/b6435e272b38fd344046cad3f9c5d8ab.jpg

Answer 14

Diffuse Reflection

Question 15

What phrases best describes this image?

https://i.pinimg.com/736x/7c/ed/95/7ced95130075291eca1e996198699649.jpg

Answer 15

Light refracted from air to glass.
Light slowing down.

Question 16

What phrases best describes this image?

https://i.pinimg.com/736x/ea/17/b1/ea17b15a7d7136e2bd6c96b9e1eb35bf.jpg

Answer 16

Light refracted from glass to air.
Light speeding up.

Question 17

What phrase best describes this image?

https://i.pinimg.com/736x/2f/6d/e7/2f6de770ef7d8bc008ed5b5f0eb2162b.jpg

Answer 17

Law of reflection incorrectly shown

Question 18

What phrase best describes this image?

https://i.pinimg.com/736x/3f/9e/c0/3f9ec05250b19684a96eeae68e326bd9.jpg

Answer 18

Mirror with correct normal marked

Question 19

What phrase best describes this image?

https://i.pinimg.com/736x/a8/07/3c/a8073ca7c277072cb03dc805642b1e19.jpg

Answer 19

Law of reflection correctly shown

Question 20

What phrase best describes this image?

https://i.pinimg.com/736x/59/7f/cb/597fcb5da800ddda0c469826d70dcff8.jpg

Answer 20

Normal marked incorrectly

Question 21

What phrases best describes this image?

https://i.pinimg.com/736x/c6/fb/ee/c6fbee5aaf898eeffbe6b43614b2bb74.jpg

Answer 21

Clear reflection.
Law of reflection correctly shown.