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Flashcards in Light Deck (25)
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1

How do light rays pass through a convex lens (diagram)

2

What does "converge" mean?

To come together

3

What happens to light rays when they pass from a less dense to a more dense medium?

They move towards the normal

4

How do light rays pass through a concave lens?

5

What is meant by descibing a substance as a "medium"?

It allows light rays to travel through it

6

Describe the "normal"

A line at 90 degrees to the boundary between two substances acting as mediums

7

What does "diverge" mean

To move further apart

8

What is meant by an "opaque" substance?

A substance that doesn't allow light to travel through it.

9

What is meant by a "transparent" substance?

A substance that lets light travel through it.

10

What is meant by a "translucent" substance?

A substance that lets some light through but makes the image fuzzy

11

Name the 3 primary colours in Science

Red

 

Green

 

Blue

12

Name the 3 basic secondary colours in Science

Yellow

 

Magenta

 

Cyan

13

Which 2 primary colours are mixed to make yellow?

Green and Red

14

What does "intensity" mean for light?

The level of light present

15

Which 2 primary colours are mixed to make magenta?

Red and Blue

16

Which 2 primary colours are mixed to make cyan?

Green and Blue

17

How can many other colours (e.g Orange..Pink..Brown etc) be made by mixing the primary colours?

By altering the intensity of one of the primary colours.

 

Orange can be made, for example, by lowering the intensity of Green light when mixing it with Red

18

How does light travel?

In straight lines called rays

19

Show how refraction occurs when a prism is used

The example shown is for a single wavelength of light

20

What colours make up the rainbow?

21

Show how white light refracts in a prism

22

Show how raindrops refract sunlight to show a rainbow

23

What is a colour filter?

A material that only allows certain colours to pass through it.

24

Why do we see certain substances as coloured?

The substance simple absorbs all the other colurs of the spectrum and reflects the colour we see.

No substance is truly coloured. It simply absorbs and reflects different wavelengths of white light

25

 

i)   angle of incidence

ii)   angle of reflection

iii)  The normal