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Science · 2023 · 2 marks
CBSE 2023 · Region 4 · Set 1 · Q25
(A) Observe the following diagram and answer the questions following it: (i) Identify the defect of vision shown. (ii) List its two causes. (iii)…
Observe the following diagram and answer the questions following it:
(i)
Identify the defect of vision shown.
(ii)
List its two causes.
(iii)
Name the type of lens used for the correction of this defect.
The colour of clear sky from the earth appears blue but from the space it appears black. Why?
Marking-scheme solution
(A) (i) Myopia / Short Sightedness
(ii) - Excessive curvature of eye lens
Elongation of eye ball
(iii) Concave lens /Diverging Lens OR
(B) • Size of particles in the atmosphere is smaller than the wavelength of visible light, so they scatter light of shorter wavelengths i.e. blue.
In space, there is no scattering of light due to absence of particles. (no atmosphere)
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.