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MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light

Dinajpur Board 2021

The image-

  1. i. virtual and upright
  2. ii. larger than the object
  3. iii. formed at the principal focus

Think it through first, then pick an option.

  1. a i and ii
  2. b i and iii
  3. c ii and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: a i and ii

The right combination is i and ii. An image at the principal focus forms only when the object is at infinity, and then it is real, inverted and point-sized. So iii cannot go with virtual and upright (i) or larger (ii); iii is false. A virtual, upright, larger image comes when the object is between the focus and the pole.

Why the other options are wrong

  • b i and iii: This is not the answer: iii is false: an image at the focus is real, inverted and point-sized, so it does not fit with i.
  • c ii and iii: This is not the answer: iii is false: an image at the focus is point-sized, so it does not fit with ii (larger).
  • d i, ii and iii: This is not the answer: iii is false, so the three cannot all be true.

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