Question

39. A'ray of light from denser medium strikes a rarer
medium at an angle of incidence L. The reflected
and refracted rays make an angle 90° with each
other. The angles of reflection and refraction arer
and r respectively, the critical angle is:
(a) Sin
(cot r)
(b) Sin" (coti)
(c) Sin (tan)
(d) Tan (sin i)​

Answer 1

Answer:

b is the correct answer^__^