A ray of light is incident at an angle ï from denser to rarer medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r', then the critical angle will be

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

sin-l (sin r)

sin-1 (tan r1)

sin-1 (tan i)

tan-1 (sin i)

answer is C.

(Unlock A.I Detailed Solution for FREE)

Detailed Solution

DμR=sinisinr'⇒RμD=sinr'sini=1sinC⇒sinC=sinisin90−r=sinicosr=sinicosias ∠i=∠r⇒sinC=tani⇒C=sin−1tani

Watch 3-min video & get full concept clarity