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Science · 2025 · 2 marks
The Human Eye and the Colourful WorldDefects of Vision and their Correction2 marksUnderstandvery short answer
CBSE 2025 · Region 3 · Set 1 · Q25
(a) A student has difficulty in reading his textbooks but can read the blackboard clearly while sitting in the last row. Name the defect of vision…
(a)
A student has difficulty in reading his textbooks but can read the blackboard clearly while sitting in the last row. Name the defect of vision the student is suffering from. List two reasons due to which this defect arises. Write the nature of the lenses required to correct this defect.
OR
(b)
Draw a ray diagram to show the path of a ray of light falling obliquely on one of the refracting faces of a triangular glass prism and mark the angle of deviation on it.
Marking-scheme solution
(a) Hypermetropia /Farsightedness/Longsightedness. Reasons:
(i) Focal length of the eye lens is too long
(ii) Eyeball becomes too small.
Correction Convex lens /Converging lens
DIAGRAM DIRECTION OF RAYS MARKING OF ANGLE
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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.