Light

Question 1

What is transmission?

Answer 1

When a wave passes through a medium

Question 2

What happens when a wave hits an interface?

Answer 2

It will be either transmitted, reflected or absorbed

Question 3

What is an interface?

Answer 3

A boundary between two materials

Question 4

What is the law of reflection?

Answer 4

The angle of incidence = the angle of reflection

Question 5

What is an incident ray?

Answer 5

The ray shone at an object

Question 6

What is the angle of incidence?

Answer 6

The angle between the normal and the incident ray

Question 7

What is the normal?

Answer 7

A line at 90° to the surface a ray hits

Question 8

What is the angle of reflection?

Answer 8

The angle between the normal and the reflected ray

Question 9

What is refraction?

Answer 9

The change in the direction of a wave at the interface

Question 10

What does an object look like if it absorbs all light?

Answer 10

Opaque

Question 11

What does an object look like if all light is transmitted through it?

Answer 11

Transparent

Question 12

What happens to light if it travels through a material less dense?

Answer 12

It speeds up and bends away from the normal

Question 13

What happens to light if it travels through a material more dense?

Answer 13

It slows down and bends towards the normal

Question 14

What is specular reflection?

Answer 14

Reflection from a smooth, flat surface eg. Reflection off a mirror

Question 15

What is diffuse reflection?

Answer 15

Reflection off a rough surface

Question 16

What is the opposite of upright?

Answer 16

Inverted

Question 17

What is the opposite of magnified?

Answer 17

Diminished

Question 18

What is a real image?

Answer 18

An image that can be projected onto a screen

Question 19

What is a virtual image?

Answer 19

An image that looks like it is in one place, but is not in reality. Eg. A reflection on a mirror

Question 20

What is the order of colours in the visible light spectrum?

Answer 20

Red
Orange
Yellow
Green
Blue
Indigo
Violet

Question 21

Which colour has the longest wavelength?

Answer 21

Red

Question 22

Which colour has the shortest wavelength?

Answer 22

Violet

Question 23

Which colour has the highest frequency?

Answer 23

Violet

Question 24

Which colour has the lowest frequency?

Answer 24

Red

Question 25

When a particle absorbs radiation, what increases?

Answer 25

It’s internal energy

Question 26

How can we see blue?

Answer 26

A spectrum of white light will hit the object, all the colours of the visible light spectrum will be absorbed, apart from blue which is reflected into our eyes

Question 27

If an object absorbs all light, what colour will it appear?

Answer 27

Black

Question 28

How would you filter the colour of a ray of white light?

Answer 28

You would use colour filters

Question 29

What happens when the angle of incidence is smaller than the critical angle?

Answer 29

Refraction

Question 30

What happens when the angles of incidence is larger than the critical angle?

Answer 30

Total internal reflection

Question 31

What is the critical angle?

Answer 31

The angle of incidence where the angle of reflection will be 90°

Question 32

What happens when a light ray hits a concave lens at an angle?

Answer 32

It diverges