Light travels in two media $M_{1}$ and $M_{2}$ with speeds $1.5 \times 10^{8} \mathrm{~ms}^{-1}$ and $2.0 \times 10^{8} \mathrm{~ms}^{-1}$ respectively. The critical angle between them is :
Solution
<p>Critical angle between them</p>
<p>$\sin {i_c} = {{{\mu _2}} \over {{\mu _1}}} = {{{v_1}} \over {{v_2}}}$</p>
<p>$\sin {i_c} = {3 \over 4}$</p>
<p>$\Rightarrow \tan {i_c} = {3 \over {\sqrt 7 }}$</p>
<p>${i_c} = {\tan ^{ - 1}}{3 \over {\sqrt 7 }}$</p>
About this question
Subject: Physics · Chapter: Optics · Topic: Reflection and Mirrors
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