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Total internal reflection can take place only if (a) light goes from optically rarer medium

Monjur Alahi

Total internal reflection can take place only if
(a) light goes from optically rarer medium (smaller refractive index) to optically denser medium
(b) light goes from optically denser medium to rarer medium
(c) the refractive indices of the two media are close to different
(d) the refractive indices of the two media are widely different


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Salim Ahmed Kawsar

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(b) According to Snell’s Law,  sin i/ sin r =μ 2/μ 1 = where r = 90º for particular incidence angle called critical angle. When the incidence angle is equal to or greater than ic , then total internal reflection occurs. It takes place when ray of light travels from optically denser medium (μ1 > μ2 ) to optically rarer medium.

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