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Question

In a thin prism of glass (refractive index $$1.5$$), which of the following relations between the angle of minimum deviation $$\delta_m$$ and angle of refraction $$r$$ will be correct?


A
δm=r
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B
δm=1.5r
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C
δm=2r
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D
δm=r2
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Solution

The correct option is A $$\delta _{m}=r$$
For a thin prism $$\delta = (\mu -1)A$$

Also at angle of minimum deviation, $$r = A/2$$

So, $$\delta_{min} = (\mu -1)2r $$
=> $$\delta_{min} = (1.5 -1)2r$$
=> $$\delta_{min} = r$$

Physics

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