Ray of light is incident on medium of refractive index at an angle of incident are after reflection the angle of deviation is Delta then one upon mu
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From Snell's Law, μ= sinr /sini
∴ As r = i/ 2
-> So, μ= sin i/sini/2 = 2sin i/2 cos i/2 / sin i/2
= 2cos i/2
= cos i/2 = μ /2
= i/2 = cos-1 μ/2
= i = 2cos-1 μ/2
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