A prism is made of glass of unknown refractive index.A parallel beam of light is incidence on the first refracting face of prism.The angle of minimum deviation is measured to be `40^(@)` .What is the refractive index of material of the prism? The refracting angle of prism is `60^(@)`. [`sin50^(@)`=0.766]]

Explanation

`n~=1.53 and D_(m)` for prism in water `~=10^(@)`