PU E 2026 Geometrical Optics Free Quiz 2

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PU E 2026 Geometrical Optics Free Quiz 2

PU E Quiz

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General 10 MCQs

11. 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

12. What is the critical angle?

A. 0° B. 90° C. 45° D. 180°

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

A. 30° B. 45° C. 90° D. 48.6°

14. Why does a diamond sparkle?

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

15. Which lens converges light rays?

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

16. Which lens diverges light rays?

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

17. 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

18. What is the power of a lens?

A. P = f B. P = 1/f² C. P = f² D. P = 1/f

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

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

20. What image does a convex lens form when the object is beyond the focal point?

A. Virtual, upright B. Real, upright C. Real, inverted D. Virtual, inverted

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