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In determining the refractive index of a glass slab using a travelling microscope, the following readings are tabulated (a) Reading of travelling microscope for ink mark =5.123 ~cm (b) Reading of travelling microscope for ink mark through glass slab =6.123 ~cm (c) Reading of travelling microscope for chalk dust on glass slab =8.123 ~cm From the data, the refractive index of a glass slab is

Options

  1. A1.500
  2. B1.601
  3. C1.399
  4. D1.390

Correct answer

A. 1.500

Step-by-step solution

aligned & Real depth =(8.123-5.123)=3 ~cm & Apparent depth =8.123-6.123=2 ~cm & n = R.D A.D =1.5 aligned

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