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Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 3 · Q33
When an incident ray of light enters in a medium 'X' from medium 'Y', it bends away from the normal. Comment about the following: (a) Speed of light…
When an incident ray of light enters in a medium 'X' from medium 'Y', it bends away from the normal. Comment about the following :
(a)
Speed of light in medium 'X' with respect to the speed of light in medium of 'Y'.
(b)
Optical density of medium 'X' with respect to the optical density of medium 'Y'. Give reason for your answer in each case.
Marking-scheme solution
(a)
Speed of light in medium 'X' is more than in medium 'Y'.
Because light ray bends away from the normal in optically rarer medium.
(b)
Optical density of medium 'X' is less than medium 'Y'.
Because in optically rarer medium light bends away from the normal.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.