Refraction

Question 1

n =

Answer 1

Real depth/apparent depth

Question 2

Lateral shift =?

Answer 2

t = 1 - 1/n

Question 3

Relationship between critical angle and n

Answer 3

n = 1/ sin c

Question 4

Optical path?

Answer 4

Optical path is constant

nt = constant

Where t is the thickness of the medium

Question 5

For spherical surface refraction formula?

Answer 5

n/v - 1/u = (n-1)/R
(Rarer to denser)

1/v - n/u = (1-n)/R
(Denser to rarer)

Question 6

Lens formula

Answer 6

1/v - 1/u = 1/f

Question 7

Lateral magnification

Object perpendicular to principal axis

Answer 7

m = v/u

Question 8

Axial magnification

Object parallel to principal axis

Answer 8

m = (v/u)^2

Question 9

Power of lens

Answer 9

P = 1/f

f should be in m

Question 10

Lens makers formula

Answer 10

1/f = (n-1)(1/R -1/R’)

Question 11

Combined focal length

Answer 11

1/F = 1/f + 1/f’ +……

Question 12

Combined power

Answer 12

P = P + P’ +…..

Question 13

Combined magnification

Answer 13

m = m x m’ x….

Question 14

Combined focal length of the two lenses are separated by a distance d

Answer 14

1/F = 1/f + 1/f’ - d/ff’

Question 15

Combined power if the two lens are separated by a distance d

Answer 15

P = P + P’ - PP’d