The refractive index of air with respect to glass is defined as `n_(ga)=(sin i)/(sin r)`
Write a similar expression for `n_(ag)` in terms of I and r.

A radioactive substnce havig N nuclei has activity R.Write down an expressin for its half-life in terms of R and N.

The refractive index of air w.r.t glass is 2//3 .The refractive index of diamond w.r.t. air is 12//5 .What is the refrative index of glass w.r.t. diamond?

What is the law of refraction in terms of angles i and r ?

If refractive index of glass w.r.t. air is 1.55, then what is the refractive index of air w.r.t. glass.

Refractive index of water w.r.t. air is 4/3 and that of glass w.r.t air is 2/3 what will be the refractive index of glass w.r.t water ?

Express sin^(5)theta in term of sin ( n theta), n in N .

A spherical surface radius of curvatue R seprates air (refractive index 1.0) from glass 9refractive index 1.5).The centre of curvature is in the glass.A point object P is placed in air is found to have a real image Q in the glass.The line PQ cuts the surface at a point O and PO = OQ[Fig.2.47].Find the distance of object from the shperical surface. .

A light beam is travelling from Region I to IV (figure). The refractive index in regionals I,II,III and IV are n_0=(n_0)/(2)(n_0)/(6) and (n_0)/(8) respectively. The angle of incidence theta for which the beam just misses entering region IV is-