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Science · 2025 · 2 marks
Light - Reflection and RefractionRefraction of Light and Refractive Index2 marksUnderstandvery short answer
CBSE 2025 · Region 5 · Set 2 · Q23
When an incident ray of light enters a medium 'X' from air, it bends towards the normal. Infer about the following with respect to air: (a) Optical…
When an incident ray of light enters a medium 'X' from air, it bends towards the normal. Infer about the following with respect to air :
(a)
Optical density of medium 'X'.
(b)
Speed of light through medium 'X' Give reason for your answer in each case.
Marking-scheme solution
(a) Optical density of X is more than optical density of air because the ray coming from air bends towards the normal as it enters the medium X.
(b) Speed of light through medium X is less than the speed of light through air because X is optically denser than air.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.