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AIIMS2018PhysicsRay Optics

In the figure, a ray of light is perpendicular to the face A B of a glass prism ( =1.52) . Find the value of so that the ray is totally reflected at face A C , if the prism is immersed in water ( =1.33) . Given 61^ =0.875

Options

  1. A45^
  2. B30^
  3. C15^
  4. DNone of these

Correct answer

B. 30^

Step-by-step solution

Given, _g=1.52, _w=1.33, = ? Apply Snell's law at point D , aligned & _g i_c= _w 90^ & i_c= _w _g = 1.33 1.52 aligned i_c= ⁻¹ ( 1.33 1.52 )=61^ From figure, +i_c=90^ =90^ -61^ =29^ 30^

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