geometric optics

Question 1

law of reflection

Answer 1

the angle of incidence = angle of reflection

AND

incident ray, reflected ray and the normal all lie on the same plane

Question 2

refraction

Answer 2

change in direction of a wave passing from one medium to another caused by its change in speed

Question 3

refraction index

Answer 3

is the ration of the speed of light in a vacuum to its speed in the material

N=c/v
N= refractive index
C = speed of light in vacuum
V = speed of light in medium

Question 4

optical density

Answer 4

is a measure of the refracting power of a medium

Question 5

normal

Answer 5

the line which is perpendicular to the plane of the surface

Question 6

angle o incidence

Answer 6

is the angle between the normal and the incoming light ray

Question 7

angle of refreaction

Answer 7

angle between normal and refracted light ray

Question 8

critical angle

Answer 8

is the angle of incidence where the angle of refraction is 90 degrees

Question 9

Total internal reflection

Answer 9

Light must travel from an optically more dense medium to an optically less dense medium and the angle of incidence must be more Than the critical angle