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NEET 2017 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2017

A thin prism having refracting angle is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

Answer: (2)

Solution

For a thin prism the deviation is . "Dispersion without deviation" means the net mean deviation is zero, so the two prisms deviate in opposite senses by equal amounts:

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Question ID VK-092058