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O Levels Physics (5054)•5054/12/M/J/20
Question 33 from 5054/12/M/J/20

Explanation

Virtual Image Formation with Converging Lens

Steps:

  • Identify conditions: Converging lens forms virtual, magnified image when object is inside focal length (f).
  • Trace principal rays: Ray parallel to axis refracts through focal point on opposite side; ray through center passes undeviated; ray toward focal point on object side emerges parallel.
  • For virtual image: Rays diverge after lens, extend backward to form erect, enlarged image on object side.
  • Select diagram: Choose one showing object inside f, diverging rays after lens tracing to virtual image behind lens.

Why D is correct:

  • Diagram D places object inside f, with diverging rays after lens extending backward to erect, magnified virtual image, per lens formula (1/v - 1/u = 1/f, where u < f yields negative v).

Why the others are wrong:

  • A: Shows rays converging to real image on opposite side, not virtual.
  • B: Depicts object outside f, forming inverted real image, not magnified virtual.
  • C: Illustrates parallel incident rays focusing at f, ignoring object position for virtual image.

Final answer: D

Topic: Thin lenses

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