Question

Q.1) Find refractive index of glass,if the speed of light in glass is 2×10⁸ and speed of light in air is 3×10⁸ m/s.

2)The far point of a myopic person is 150 cm in front of the eye.Calculate the focal length and the power of a lens required to enable him to see distant object clearly ?

Answer 1

refractive index of glass n=(speed of light in air)/(speed of light in glass)
n=c/v
n=3*100000000/2*100000000
n=3/2
n=1.5 (refractive index of water)                        Ans.