Light is incident from a medium into air at t | vedclass

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(B) Velocity of light in the medium is given by $v = \frac{d}{t} = \frac{3.0 	imes 10^{-2} \ m}{0.2 	imes 10^{-9} \ s} = 1.5 	imes 10^8 \ m/s$.The

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suffer total internal reflection in case $(B)$ only

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(B) Velocity of light in the medium is given by $v = \frac{d}{t} = \frac{3.0 	imes 10^{-2} \ m}{0.2 	imes 10^{-9} \ s} = 1.5 	imes 10^8 \ m/s$.The refractive index of the medium with respect to air is $\mu = \frac{c}{v} = \frac{3 	imes 10^8 \ m/s}{1.5 	imes 10^8 \ m/s} = 2$.The critical angle $C$ is given by $\sin C = \frac{1}{\mu} = \frac{1}{2}$,which implies $C = 30^o$.Total internal reflection $(TIR)$ occurs when the angle of incidence $i > C$. For case $(A)$,$i = 20^o For case $(B)$,$i = 40^o > 30^o$,so it will undergo total internal reflection.Therefore,the ray will suffer total internal reflection in case $(B)$ only.

Light is incident from a medium into air at two possible angles of incidence $(A) \ 20^o$ and $(B) \ 40^o$. In the medium,light travels $3.0 \ cm$ in $0.2 \ ns$. The ray will

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