First slide
Ray optics
Question

For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index :

Easy
Solution

Dm=Aμ=Sin2A2SinA/2=2sinA/2cosA/2sinA/2 

μ2=cosA/2            If    A=90o,μ=2

If  A=0,   μ=2

So μ  lies between 2 and 2

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