physics grade 10

Question 1

lens that corrects near sightedness

Answer 1

concave

Question 2

lens that corrects farsightedness

Answer 2

Convex

Question 3

How do rainbows form

Answer 3

Sky is filled with water droplets
Sunlight enters the water droplet and refracts towards the normal
Two refractions result in a dispersion of the light
Image is a virtual image because your brain projects these refracted light rays backwards and forms a virtual image of the visible spectrum
The colours in a rainbow all come from different droplets
Only happens when the sun is behind you

Question 4

Concave lenses

Answer 4

Diverging lenses

Question 5

Convex lenses

Answer 5

Converging lenses

Question 6

S,I,R used for

Answer 6

Cameras

Question 7

L,I,R used for

Answer 7

Movie projectors

Question 8

L,U,V used for

Answer 8

Magnifying glasses

Question 9

DO

Answer 9

Is always positive

Question 10

DI

Answer 10

+ for real
- for virtual

Question 11

F

Answer 11

+ for converging
- for diverging

Question 12

HI

Answer 12

+ if upright/ virtual
- if inverted/real

Question 13

M

Answer 13

+ if upright
- if inverted

Question 14

Refraction

Answer 14

The fact that light bends and is not straight

Question 15

What is c in n=c/v

Answer 15

3x10^8

Question 16

Apparent depth

Answer 16

As light shines off the object it speeds up when it enters air and bends away form the normal. We assume light travels in a straight line so we think that the object is farther away then it really is.

View diagram

Question 17

Critical angle

Answer 17

The refracted ray of light follows a path exactly along the surface of the water

Question 18

Total internal reflection

Answer 18

When light reflects completely off the inside wall of a denser medium rather then passing through the wall into a less dense medium

Question 19

Dispersion

Answer 19

Is the refraction of white light into separate wavelengths or colours