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A ray of light from a denser medium strikes a rarer at an angle of incidence I (see figure). The reflected and refracted rays make an angle of `90^o` with each other. The angles of reflection and refraction are r and r’. The critical angle is
A. |
`sin^-1 (tan r)` |
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B. |
`sin^-1 (cot i)` |
C. |
`sin^(-1) (tan r’)` |
D. |
`tan^(-1) (sin i)` |