Refraction

The rule for speed of light in a medium is

• Speed in vacuum/ index of refraction

• index of refraction/ Speed in vacuum

• Speed in vacuum/Speed in medium

• more than 3 x 10⁸ m/s

n =

• c x v

• c/v

• v /c

• c +v

as index of refraction increase, speed of light in medium

• remains the same

• increases

• decreases

• doubles

the medium with the largest index of refraction, has the .............. speed of light

• lowest

• largest

• same

• double

A pencil appears to be broken in water because of

• reflection

• refraction

• diffraction

• interference

when light passes from more dense medium to less dense medium, it refracts ............. the normal

• toward

• away

• unaffected

• along the normal

when light passes from more dense medium to less dense medium it

• slows down

• speeds up

• has no change in speed

when light enters a medium at 90 degrees, it

• refracts toward the normal

• refracts away from the normal

• continues straight with no change in direction

• bounce bacl

mirage is an optical illusion caused by

• reflection

• refraction

• diffraction

• hypnosis

index of refraction is a factor that tells how much is the speed of light in a medium is reduced

• True

• False