Optics

Question 1

light passes from more dense to less dense medium, does the light ray bend towards or away from the normal?

Answer 1

light ray bends away from the normal

Question 2

light passes from less dense to more dense medium, does the light ray bend towards or away from the normal?

Answer 2

light ray bends towards the normal

Question 3

What happens when refraction occurs?

Answer 3

Wave speed and wavelength changes, frequency changes the same. Partial reflection always occurs unless total internal refraction

Question 4

refraction law

Answer 4

1. incident, refracted, and normal all lie in one plane

2. ratio of incidence angle/ refraction angle = constant known as refractive index

Question 5

air to glass refraction: less dense to more dense

glass to air refraction

Answer 5

sin i1 /sin r1= n
sin i2= sinr1 and sinr2=sini2
so sini2/sinr2=1/n

Question 6

What does the refractive index equal

Answer 6

1. sini/sinr
2. c (speed of light)/ cs (speed of wave in substance
3. wavelength of c / wavelength cs (frequency remain constant)