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A ray of light travelling in a transparent medium f refractive index `mu`, falls on a surface separating the medium from air at an angle of incidence of `45^(@)`. For which of the following value of `mu` the ray can undergo total internal reflection ?A. `mu = 1.33`B. `mu =1.40`C. `mu = 1.50`D. `mu = 1.25` |
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Answer» Correct Answer - C For total internal reflection `sin i gt sin C` where `i=` angle of incidence `C=` critical angle But, `sin C = (1)/(mu)` `:. sin u gt (1)/(mu)` or `mu gt (1)/(sin i)` `mu gt (1)/(sin 45^(@)) (I = 45^(@)` (Given) `mu gt sqrt(2)` Hence, option (C) is correct. |
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