Refraction of light

What does happen with the light when reaches the border of different transparent medium?

• Nothing

• Its direction changes

• It reflects totally

• It is absorbed

What does happen with the light in denser medium?

• Light bends TOWARDS the normal.

• Light bends AWAY FROM the normal.

• Nothing

The index of refraction of a material (except vacuum)

• less than 1

• more than zero

• more than 1

• always 1

The speed of light in optically denser medium

• is getting more

• is getting less

• doesn't change

We can see the depth of a pool

• shallower

• deeper

• in true position

Total internal refraction can occur when light attempts to move from a

• cooler to warmer medium

• more to less optical dense medium

• less to more optical dense medium

• always

Critical angle

• An angle of incidence that results in an angle of refraction of 90°

• An angle of incidence that results in an angle of refraction of 0°

• An angle of incidence that results in an angle of refraction of 180°

Where can we see the sun at sunset?

• In the true position

• Higher

• Lower

Which stars twinkle more

• no difference

• the closer

• the further

• the bigger