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A ray of light incident at an angle 90° ...

A ray of light incident at an angle 90° with the face of an equilateral prism passes symmetrically. Calculate the refractive index of the material of the prism

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As the prism is an equilateral one, `A= 60^@`. As the ray of light passes symmetrically, the prism is in the position of minimum deviation.
So `r=A/2=60^@/2=30^@`also`i=90^@ therefore =(sini)/(sinr)=(sin90^@)/(sin30^@)=1/0.5 =2`
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