5 ray model of light

Question 1

Characteristics of a plane mirror

Answer 1

-The image is of the same size of the object

-The image is upright

-The image is laterally inverted

-The distance between the image and the mirror is equal to the distance between the object and the mirror.

Question 2

Convex mirror characteristics

Answer 2

**The image formed is smaller than the object.
They provide a wide field of vision.
The image is formed behind the convex mirror.
The image is an upright and erect image.
It has a curve outward

Question 3

Characteristics of a concave mirror

Answer 3

It has a curve inward (bc they cave in)
They are commonly used when a magnified image is needed.

Question 4

Uses for convex mirrors

Answer 4

Convex mirrors can be found at road junctions to allow drivers to see around blind corners, giving them more time to respond to oncoming traffic

They are also installed at corners of shops to allow shopkeepers to see a large area of the shop in a single location.

Question 5

Concave mirror uses

Answer 5

Dentists use concave mirrors to form a magnified image of the teeth, it allows them to examine the teeth closely

Question 6

Most optically dense to least optically dense is…

Answer 6

Glass, water, air

Question 7

Does the ray of light bend towards the normal or away from the normal if the ray of light is travelling from an optically less dense to an optically denser environment?

Answer 7

It slows down and bends towards the normal.

Question 8

Does the ray of light bend towards the normal or away from the normal if the ray of light is travelling from an optically denser to an optically less dense environment?

Answer 8

Its speed increases and bends away from the normal.

Question 9

White light is made of 7 colours. Name them

Answer 9

Red, yellow, orange, yellow, green, blue, indigo, violet.

Question 10

Since red light travels the fastest, does it bend the most or does it bend the least?

Answer 10

Bends the least

Question 11

Since violet travels the slowest, does it bend the most or bend the least?

Answer 11

It bends the most

Question 12

What is the relationship between the angle of incidence and the angle of reflection?

Answer 12

The angle of reflection is equal to the angle of incidence.

Question 12

*what is reflection

Answer 12

the bouncing of light off a surface
light does not pass through a reflecting surface

Question 13

What is the process called when white light is split into the 7 primary colours?

Answer 13

Dispersion

Question 14

*what is refraction

Answer 14

it is the bending effect of light when the light ray changes speed as it travels into one optical medium to another

Question 15

How do you draw the image of reflected rays?

Answer 15

1. locate the image (image dist. = object dist.)
2. draw reflected ray (image to eye)
3. draw incident ray (object to point of incidence)

Question 16

where does the light bend from the normal when it passes through
1. from air to glass
2. from glass to air
3. from air to water

Answer 16

1. The light bend towards the normal as glass is optically more dense than air
2. the light bends away from the normal as air is optically less dense than glass
3. the light bends towards

Question 17

what are luminous objects, some examples and how do we see them?

Answer 17

They are objects that give off light
examples; fire, sun, working light bulb
light from the luminous objects enters our eyes

Question 18

what are non-luminous objects, some examples and how do we see them?

Answer 18

they are objects that do not give off light
almost ever other object, eg; pen, bottle, wallet etc
light from luminous objects reflect off non-luminous objects and enters eyes.

Question 19

what is the incident ray and the angle of incidence?

Answer 19

the incident ray is the light ray hitting the reflecting surface
the angle of incidence is the angle between the incident ray and the normal

Question 20

what is the reflected ray and the angle of reflection?

Answer 20

the reflected ray is the light travelling away from the reflecting surface after bouncing off the surface
the angle of reflection is the angle between the normal and the reflected ray

Question 21

*What are the effects of refraction?

Answer 21

Refraction makes object look closer than they are

Question 22

**What is dispersion and why does it occur

Answer 22

dispersion is when white light is split into seven primary colours

the prism refracts lights of different colours by different angles, due to the light of each colour travelling at a different speed in the prism

Question 23

What are the applications of infrared radiation and it’s cons

Answer 23

It can be used in healthcare, devices such as thermal imaging cameras can screen people for fever

it contributes to climate change

Question 24

** explain how the smooth surface of a plane mirror allows a clear image to be formed

Answer 24

Parallel rays reflect in the same direction when bounced off a smooth surface, thus forming an image

Question 25

** explain why rough surfaces are unable to form images

Answer 25

since the rough surface scatters light, the image is unable to be formed