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# The speed of light in media M1 and M2 is 1.5×108 m/s and 2.0×108 m/s respectively. A ray of light enter medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is?Equal to or less than sin−1(35)Equal to or greater than sin−1(34)Less than sin−1(23)Equal to sin−1(23)

A
Less than sin1(23)
B
Equal to sin1(23)
C
Equal to or less than sin1(35)
D
Equal to or greater than sin1(34)
Solution
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#### In total internal reflection, the angle of incidence (1) must be greater than critical angle C2μ=2andμ2=322sini≥32sin900sini≥34i≥sin−1(34)Hence,optionBiscorrectanswer.

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