The critical angle between an equilateral prism and air is …

Physics Ray Optics Prism Theory & Dispersion of Light MCQ (Single Correct)

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

After deviation it will emerge from the second refracting surface

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

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

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

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