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Question 20225
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Ray Optics: Lens Formula MCQ

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Lens FormulaEasyQuestion 20225

Question

Thin lens formula (using sign convention with object on left):
  1. A
    1/f = 1/u + 1/v
  2. B
    1/f = 1/v − 1/u
    Correct
  3. C
    1/f = 1/v + 1/u
  4. D
    1/f = u − v

Correct answer

1/f = 1/v − 1/u

Explanation

1/v − 1/u = 1/f. For a real object: u is negative. For a converging lens: f is positive. For a diverging lens: f is negative.

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