refraction and reflection

Question 1

what happens when light enters a denser median such as water

Answer 1

bends TOWARDS the normal

Question 2

what is refraction

Answer 2

light changes direction when it goes into a medium of different density.

Question 3

how does speed of light change in different mediums

Answer 3

light travels slower in denser mediums

Question 4

what is refractive index always greater than or equal to

Answer 4

1

Question 5

what does a greater refractive index means

Answer 5

means light bends through larger angles

Question 6

what is the critical angle

Answer 6

angle of incidence

such that light refracts at 90

Question 7

what happens when light goes from a dense to less dense medium

Answer 7

bends away from the normal

Question 8

what is total internal reflection

Answer 8

all of the light is reflected back inside the material

Question 9

when is total internal reflection used

Answer 9

optical fibres

endoscope

Question 10

what happens when angle of incidence is greater than critical angle

Answer 10

light will totally internally reflect