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

• A

  After deviation it will emerge from the second refracting surface

• B

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

• C

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

• D

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