The speed of light in two media '1' and '2' are v_ 1 and v_ 2 ( v_ 1 ) respectively. For…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
The speed of light in two media '1' and '2' are \(v_{1}\) and \(v_{2}\left( \gt v_{1}\right)\) respectively. For a ray of light to undergo total internal reflection at the interface of these two media, it must be incident from
- medium '1' and at an angle greater than \(\sin ^{-1}\left(\frac{v_{1}}{v_{2}}\right)\)
- medium '1' and at an angle greater than \(\cos ^{-1}\left(\frac{v_{1}}{v_{2}}\right)\)
- medium '2' and at an angle greater than \(\sin ^{-1}\left(\frac{v_{1}}{v_{2}}\right)\)
- medium '2' and at an angle greater than \(\cos ^{-1}\left(\frac{v_{1}}{v_{2}}\right)\)
Answer
(A) medium '1' and at an angle greater than ^ -1 ( v_ 1 v_ 2 )
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