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Question 185Asked in DSSSB TGT Computer Science, 24 Jun 2023, Shift 3 (4:30 PM)

The refractive index of the core of an optical fibre is greater than that of cladding because:

  1. Alight gets reflected at the entrance end of the optical fibre
  2. Bthe light gets totally internally reflected into the core
  3. Clight gets restricted at the entrance end of the optical fibre
  4. Dthe light gets refracted into cladding
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Correct answer: (B) the light gets totally internally reflected into the core

Explanation

Light stays in a denser core because rays hitting the core-cladding boundary above the critical angle undergo total internal reflection.

From DSSSB TGT Computer Science PYQ, 24 Jun 2023, Shift 3 (4:30 PM)

This is question 185 of DSSSB TGT Computer Science PYQ, 24 Jun 2023, Shift 3 (4:30 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.