PYQs
Practise questions grouped by chapter and source year.
Practice questions are organised using the years and labels in our source collection. Work through the solutions with your teacher; these are not a complete official examination paper.
Practice question 1
Source year: 20253 marksA person cannot see objects distinctly placed within 50 cm from his eyes. Name the defect of vision and the lens used to correct it. Calculate the power of lens required. [CBSE 2025]
Practice question 2
Source year: 20243 marksExplain why the sun appears reddish at sunrise and sunset. [CBSE 2024]
Practice question 3
Source year: 20233 marksWhat is meant by power of accommodation of human eye? How is the range of vision of a normal eye different from that of a person suffering from myopia? [CBSE 2023]
Practice question 4
Source year: 20222 marksDraw a labelled diagram showing the dispersion of white light through a glass prism. [CBSE 2022]
Practice question 5
Source year: 20212 marksWhy does the sky appear blue on a clear day? Explain with scientific reason. [CBSE 2021]
Formulae
Revisit important relationships and quick revision formulae.
Least Distance of Distinct Vision
D = 25 cm (for normal eye) Minimum distance at which eye can see clearly
Power for Myopia Correction
P = -1/d (in meters) d = far point distance
Power for Hypermetropia
P = 1/d - 1/D D = 25 cm (least distance of distinct vision)
Range of Vision
Normal eye: 25 cm to infinity Near point: 25 cm Far point: Infinity
Derivations
Work through the reasoning behind key concepts.
Scattering of Light (Rayleigh Scattering)
Intensity of scattered light ∝ 1/λ⁴ Blue light (shorter wavelength) scatters more than red This explains blue sky and red sunset
Correction of Myopia
For person with far point at distance d: Required focal length: f = -d Power: P = -1/d (concave lens)
Dispersion in Prism
Different wavelengths refract differently Refractive index varies: n ∝ 1/λ Red (longest λ) bends least, Violet (shortest λ) bends most
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