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QAIPM-2002-Ph-2848: NEET 2002 Physics - Class 12 AIPM-2002-Ph-2848 Solution: For the given incident ray as shown in figure, the condition of …
For the given incident ray as shown in figure, the condition of total internal refraction of this ray the required refractive index of prism will be
Multiple Choice Options
- A
- B
- C
- D
Step-by-Step Verified Solution
Applying Snell�s law of refraction at A,
_ = sin _ 45 _ sin _ r
_ r = sin _ 1 ( 1 2 _ ) ....(1)
Applying the condition of total internal reflection at B,
i c = sin _ 1 ( 1 _ ) ..........(2)
where i c is the critical angle.
From figure, r + i c = � 2
_ sin _ 1 ( 1 2 _ ) = � 2 _ sin _ 1 ( 1 _ )
_ sin _ 1 ( 1 2 _ ) = cos _ 1 ( 1 _ ) = sin _ 1 ( _ 2 _ 1 _ )
_ 1 2 _ = _ 2 _ 1 _
_ _ 2 = 1 + 1 2
_ _ = 3 2