✓ Board-verified
Science · 2025 · 3 marks
CBSE 2025 · Region 6 · Set 1 · Q32
A person uses lenses of +2.0 D power in his spectacles for the correction of his vision. (a) Name the defect of vision the person is suffering from.…
A person uses lenses of +$\displaystyle 2.0$ D power in his spectacles for the correction of his vision.
(a)
Name the defect of vision the person is suffering from.
(b)
List two causes of this defect.
(c)
Determine the focal length of the lenses used in the spectacles.
Marking-scheme solution
(a) Hypermetropia
(b) Two causes:
Eye ball has become too small /Eye ball is shortened
The focal length of the eye Lens is long / eye lens becomes
less convergent(c) \[\begin{aligned}
\text { Focal length } & =\frac{1}{P} \\
& =\frac{1}{2}=+0.5 \mathrm{~m}
\end{aligned}
\]
All The Human Eye and the Colourful World questions2025 question paperNCERT solutions: The Human Eye and the Colourful WorldPractice The Human Eye and the Colourful World →
More from The Human Eye and the Colourful World
- The Phenomena of light involved in the formation of a rainbow in the sky are2024
- A person allowed a narrow beam of white light from the sun to enter a dark room through a small aperture and placed a glass prism in its path in such…2025
- The curvature of eye lens of human eye2025
- Assertion: Myopic eye cannot see distant objects distinctly. Reason (R): For the correction of myopia converging lenses of appropriate power are…2024
- A narrow beam XY of white light is passing through a glass prism ABC as shown in the diagram: Trace it on your answer sheet and show the path of the…2023
- A narrow beam, PQ of white light is passing through a glass prism ABC as shown in the diagram. Draw a ray diagram to show the emergent beam as it…2024
- When a beam of white light passes through a region having very fine dust particles, the colour of light mainly scattered in that region is:2024
- A person is suffering from an eye defect in which the far point of the eye is nearer than infinity. Identify the defect. List two main causes of this…2023
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.