PU M 2026 Geometrical Optics Free Quiz 2

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PU M 2026 Geometrical Optics Free Quiz 2

PU M Quiz

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General 10 MCQs

11. What is an optically rarer medium?

A. Higher refractive index B. Lower refractive index C. Equal refractive index D. Zero refractive index

12. When does total internal reflection occur?

A. Denser to rarer medium at angle > critical angle B. Rarer to denser medium at angle > critical angle C. Denser to rarer medium at angle < critical angle D. Rarer to denser medium at angle < critical angle

13. What principle do optical fibers work on?

A. Refraction B. Reflection C. Total internal reflection D. Diffraction

14. What is the approximate critical angle for water-air interface?

A. 30° B. 45° C. 90° D. 48.6°

15. Why does a diamond sparkle?

A. High refractive index causing total internal reflection B. Low refractive index C. Reflection from surface D. Refraction

16. Which lens converges light rays?

A. Convex lens B. Concave lens C. Plane lens D. Cylindrical lens

17. Which lens diverges light rays?

A. Convex lens B. Concave lens C. Plane lens D. Cylindrical lens

18. What is the lens formula?

A. 1/f = 1/u - 1/v B. 1/f = 1/u + 1/v C. 1/f = 1/v - 1/u D. 1/f = 1/u - 1/v

19. What is the power of a convex lens of focal length 0.5 m?

A. 2 D B. 0.5 D C. 5 D D. 10 D

20. What is the sign of power for a concave lens?

A. Positive power B. Negative power C. Zero power D. Infinite power

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