# (I) Define Critical Angle. (Ii) State One Important Factor Which Affects the Critical Angle of a Given Medium. - Physics

Numerical

(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.

#### Solution

(i) The angle of incidence for which the angle of refraction is 90o is called critical angle.

"_1  mu _2 = (sin i_c)/(sin (90^circ))

therefore (mu_2)/(mu_1) = (sini_c)/(1)

 therefore 1/mu = sini_c " If " mu_2 = 1  mu_1 = mu

 therefore  i_c = sin^(-1) (1/mu)

(ii) Relative refractive of the medium ("_1 mu_2)1

Concept: Total Internal Reflection
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