Relation among the (i),(e),(A) and (δ) ‌ri+e‌=A+δ ‌
3
4
×60∘+‌
3
4
×60∘‌=60∘+δ ‌‌ or ‌‌45∘+45∘‌=60∘+δ ‌‌ or ‌‌δ‌=30∘ where, i= angle of incidence e= angle of emergence A= angle of prism δ= angle of deviation