Multiple choice

Using the lens formula, calculate the image distance when an object is placed at a distance of 5 cm from a convex mirror of focal length 10 cm.

  1. 3 cm

  2. -10 cm
    • 0.1 cm

  4. 0.3 cm

  5. 15 cm
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A Correct answer
Explanation

Focal length of the convex mirror, f = + 10 cm Object distance, u = - 5 cm According to the lens formula, we get 1/v + 1/u = 1/f
1/v = 1/f - 1/u = 1/10 - 1/- 5 v = 3 cm

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