Easy MCQ +4 / -1

The lens formula is:

  1. A $1/f = 1/v - 1/u$ Correct answer
  2. B $1/f = 1/v + 1/u$
  3. C $1/f = u - v$
  4. D $f = uv/(u+v)$

Solution

$1/f = 1/v - 1/u$ (Cartesian sign convention).

About this question

Subject: Physics · Chapter: Optics · Topic: Lenses and Optical Instruments

This question is part of PrepWiser's free JEE Main question bank. 12 more solved questions on Optics are available — start with the harder ones if your accuracy is >70%.

More Optics questions

Drill 25 more like these. Every day. Free.

PrepWiser turns these solved questions into a daily practice loop. Chapter-wise drills, full mocks, AI doubt chat. No auto-renew.

Start free →