P14 - Light

Question 1

What are the two main types of lenses

Answer 1

Convex and concave

Question 2

What is another name for a convex lens and why?

Answer 2

Converging lens because they cause the light rays to converge (come together)

Question 3

What is the shape like in a convex lens?

Answer 3

The lens buldges outwards

Question 4

What does the bulging shape of convex lens cause parallel rays to do?

Answer 4

Causes rays of light to be broight together at the principle focus

Question 5

What is the shape like in a concave lens?

Answer 5

The lens caves inwards

Question 6

What does the caving shape of convex lens cause parallel rays to do?

Answer 6

Causes parallel rays of light to diverge (spread out)

Question 7

All lenses have a principle focus on both sides. True or False?

Answer 7

True

Question 8

The two principle focuses on both sides are the same distance from the lens. True or false?

Answer 8

True

Question 9

What is another term for the principle focus?

Answer 9

The focal point

Question 10

What will the principle focus ALWAYS sit on?

Answer 10

The axis

Question 11

What is the focal length?

Answer 11

Thr distcance between the centre of the lens and the principle focus

Question 12

If the shorter the focal length is, the more __________ the lens will be

Answer 12

Powerful

Question 13

What does it mean when a lens is more powerful?

Answer 13

It refracts light more strongly

Question 14

How do you make a lens more powerful?

Answer 14

Make the lens more curved
Or use a different material that refracts light more strongly

Question 15

How is an image formed?

Answer 15

When all the light rays from a particular point on a object, appear to come together

Question 16

What is a ‘real image’?

Answer 16

Where light rays come together to form an image on a ‘screen’

Question 17

What is a ‘real image’?

Answer 17

Where light rays come together to form an image on a ‘screen’

Question 18

What is a virtual image?

Answer 18

Where light rays dont come together, so the light from the object appears to be coming from a different place

Question 19

What is the most common example of a virtual image?

Answer 19

A mirror

Question 20

Why is a mirror an example of a virtual image?

Answer 20

You appear to be behind the mirror,
but there is no rays behind the mirror
because its a solid that light cant past through

Question 21

When you comment on a real image example, what must you say?

Answer 21

Its real
The image is inverted
The image is smaller

Question 22

When you comment on a virtual image example, what must you say?

Answer 22

Its virtual
The image is upright
The image is smaller

Question 23

What image does a convex lense always produce?

Answer 23

A virtual image

Question 24

How to calculate the magnification produced by a lens?

Answer 24

Magnification = image height / object height

Question 25

What happens when you mix pure red, green and blue?

Answer 25

It creates white light

Question 26

What are opaque objects?

Answer 26

Objects that dont transmit light. They relfect it or absorb it.