NEET Physics Ray Optics and Optical Instruments Questions Solved

NEET - 2011

A third prism of angle 15° made of glass of refractive index μ1=1.5 is combined with another prism of glass of refractive index μ2=1.75. The combination of the prism produces dispersion without deviation. The angle of the second prism should be 

(a) 7°                                              (b) 10°

(c) 12°                                             (d) 5°

For without deviation 

    AA'=μ'-1μ-115°A'=1.75-11.5-115A'=0.750.50  A'=0.50×150.75=10°

Difficulty Level:

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