Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Ray Optics/
Question 20227
JEE Physics · Easy

Ray Optics: Power of Lens MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Power of LensEasyQuestion 20227

Question

Power of a lens with focal length f (in metres) is:
  1. A
    P = 1/f
    Correct
  2. B
    P = f
  3. C
    P = f²
  4. D
    P = 1/f²

Correct answer

P = 1/f

Explanation

P = 1/f in dioptres (D). Converging lens: f > 0 → P > 0. Diverging lens: f < 0 → P < 0. Two thin lenses in contact: P_total = P₁ + P₂.

Review Ray Optics notesStart timed chapter practice