The figure below shows a light ray traveling in a slab of crown glass surrounded

Question

The figure below shows a light ray traveling in a slab of crown glass surrounded by air. The ray is incident on the right surface at an angle of 55 degree with the normal and then reflects from points A, B, and C. (Select all that apply.) At which of these points does part of the ray enter the air? (Select all that apply.) If the glass slab is surrounded by carbon disulfide, at which point part of the ray enter the carbon disulfide? (Select all that apply. The index of refraction of carbon disulfide is 1.628, and the index of refraction of the glass is 1.52.)

Explanation / Answer

The crictical angle is 41 deg for 1st part thus there will be total internal reflection at A and would have also been at C if they had not been reffracted at B

The ray enters from glass to carbon disulphide at every possible position on the interface because no total internal reflection is not possible for a ray from lighter to a denser medium

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