3.18

n = sin i / sin r 

n=  refractive index -> number telling how good the material can bend the light
i = Angle of incidence
r = Angle of refraction

3.17

3.17 Describe experiments to investigate the refraction of light, using rectangular blocks, semicircular blocks and triangular prisms

3.16

For plane mirrors, the image is…

·         The same size / same distance as the object from the mirror

·         Virtual (not real)

·         Upright

·         Laterally Inverted

3.15

Light travels in straight line.
Shadows are formed in the area behind an object where light can not reach.

Light sources = They travel straight to our eyes
Reflected light = Light from the sources strike at the object and some of the light is reflected to our eyes

Angle of incidence = Angle of reflection