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Q3
(CDS-II/2021)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Geometrical optics
Answer Verified
A-ray of light travelling from a rarer medium to a denser medium
Result
Your answer:
—
·
Correct:
B
Explanation
When a ray of light travels from an optically rarer medium to an optically denser medium, it undergoes a change in speed and direction due to the difference in refractive indices. Light travels fastest in a vacuum and slows down when it enters a medium with a higher optical density [2]. According to Snell's Law, this reduction in speed causes the light ray to bend towards the normal line at the interface of the two media [5]. Conversely, when light moves from a denser to a rarer medium, it speeds up and bends away from the normal [3]. Therefore, the correct behavior for a ray entering a denser medium from a rarer one is that it slows down and bends towards the normal [1].
Sources
- [1] Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > Activity 9.10 > p. 149
- [2] Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > 9.3.2 The Refractive Index > p. 148
- [3] Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > Activity 9.10 > p. 147
- [5] https://www.ncbi.nlm.nih.gov/books/NBK594230/
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