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Science and Technology question from JKAS Prelims, 2023 by JKPSC

Consider the following statements about light refraction:

1. When light passes from a rarer medium to a denser medium, it slows down and bends towards the normal.
2. When light passes from a denser medium to a rarer medium, it speeds up and bends away from the normal.

The correct statement/s is/are

Last updated Jun 24, 2026
Correct Answer: Option C — Both
Both statements accurately describe the fundamental laws of refraction. The direction in which light bends is determined by the change in its speed as it moves between materials of different optical densities.

Detailed Explanation
Statement 1 (Rarer to Denser): When light moves from a medium like air (rarer) into glass or water (denser), the particles of the medium "slow down" the light wave. Because one side of the light wave hits the denser boundary first, it pivots, causing the beam to bend towards the normal (an imaginary line perpendicular to the surface).

Statement 2 (Denser to Rarer): Conversely, when light exits a dense medium (like glass) and enters a rarer one (like air), it "speeds up." This causes the beam to push further out, bending away from the normal.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.

About this question

JKPSC JKAS 2023 Prelims

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Exam JKPSC
Recruitment JKAS
Stage Prelims
Year 2023
Subject Science and Technology
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