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The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then

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It is totally reflected from all three sides of the prism and never emerges out

It is totally reflected on the second surface and emerges out perpendicularly from the third surface in the air

After deviation it will emerge from the second refracting surface

It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface

answer is B.

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It is totally reflected on the second surface and emerges out perpendicularly from the third surface in the air.

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