Question

what will be the answer​

Answer 1

Explanation:

hey mate,

we the relation,

i+e=A+∆

where i=angle of incidence

e=angle of emergence

A=angle of prism

∆=angle of deviation

given:

i=30°

e=45°

A=60° (as the prism is equilateral)

so,∆=30°+45°-60°

∆=15° (answer)