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
B
δm=1.5r
C
δm=2r
D
δm=r2

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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