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1.51.61.71.8

Answer :

ASolution :

`"We know", delta = i + e - A` <br> `or, " " 40^(@) = 35^(@) + 79^(@) - A or, A = 74^(@)` <br> Now, the minimum value of angle of deviation, `delta_(m) le 40^(@)` <br> `"In that case", mu le (sin""(A + delta_(m))/(2))/(sin""(A)/(2))` <br> `or, " " mu le(sin""(74^(@) + 40^(@))/(2))/(sin""(74^(@))/(2))` <br> `or, " " mu le 1.39` <br> `therefore " " mu_(max) = 1.5` <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/CHY_DMB_PHY_XII_P2_U06_C02_E09_018_S01.png" width="80%">