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

Sylhet Board 2021

At what angle must a plane mirror be fixed to see round a bend in the road?

Think it through first, then pick an option.

  1. a 30°
  2. b 45°
  3. c 60°
  4. d 90°
Answer and explanation

Correct answer: b 45°

At an almost right-angle bend of a hill road a large plane (or convex) mirror is fixed at 45°, so vehicles on both sides can see what is on the other side of the road.

Why the other options are wrong

  • a 30°: This is not the answer: At an almost right-angle bend of a hill road a large plane (or convex) mirror is fixed at 45°, so vehicles on both sides can see what is on the other side of the road.
  • c 60°: This is not the answer: At an almost right-angle bend of a hill road a large plane (or convex) mirror is fixed at 45°, so vehicles on both sides can see what is on the other side of the road.
  • d 90°: This is not the answer: At an almost right-angle bend of a hill road a large plane (or convex) mirror is fixed at 45°, so vehicles on both sides can see what is on the other side of the road.

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