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Topic

Optics

Asked 51 times across 6 UPSC exams over 47 years (1979–2026), peaking in 2022.
51
PYQs
6/4
Exams
14
Years active
1979–2026
Span
2022
Peak
46/51
Answers

Sample questions

CDS2026
An object is placed at a distance of 15 cm in front of a concave mirror with a radius of curvature of 20 cm. Which one among the following statements is correct for the image formed ?
  1. A The image is 30 cm from the mirror on the same side as the object. ✓
  2. B The image is formed at a distance of 30 cm behind the mirror.
  3. C The image is 60 cm from the mirror on the same side as the object.
  4. D The image is formed at a distance of 60 cm behind the mirror.
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CAPF2025
When sunlight (white light) falls on a triangular glass prism, a band of colours called a spectrum is obtained. Which one among the following represents this effect appropriately?
  1. A Reflection
  2. B Diffraction
  3. C Refraction
  4. D Dispersion
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
CAPF2025
Which one among the following statements related to human eye is correct?
  1. A For a person suffering from short-sight defect, the image of a distant object is focused behind the retina.
  2. B Short-sight defect can be corrected by a converging spectacle lens.
  3. C For a person suffering from long-sight defect, the image of a near object is focused behind the retina.
  4. D Long-sight defect can be corrected by a diverging spectacle lens.
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry

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