The principle section of a glass prism is an isosceles triangle ABC with AB = AC, the face AC is silvered. A ray of light is incident normally on the face AB and after tworeflections, it emerges from the base BC perpendicular to the base. Angle of BAC of the prism is

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

300

360

180

720

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

∠DEF=2A In triangle DEF , 900+2A+(900-θ)=1800 ⇒θ=2A In triangle ABC θ=π2-A2 Therefore 2A=π2-A2⇒A =360

Watch 3-min video & get full concept clarity