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Question 20191
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Ray Optics: Mirror Formula MCQ

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Mirror FormulaEasyQuestion 20191

Question

The mirror formula (using New Cartesian sign convention with incident light along +x axis) is:
  1. A
    1/f = 1/u + 1/v
  2. B
    1/f = 1/v − 1/u
  3. C
    1/v + 1/u = 1/f
    Correct
  4. D
    1/f = u + v

Correct answer

1/v + 1/u = 1/f

Explanation

For spherical mirrors: 1/v + 1/u = 1/f = 2/R. Using sign convention: object at −ve u (real object), f = −R/2 for concave.

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