An object is placed 30 cm in front of a plane mirror. How far is the image from the object?

Answer and explanation

Correct answer: A. 60 cm

  1. Step 1: The image is as far behind the mirror as the object is in front, so the separation is 2 x 30 = 60 cm. Answer: 60 cm. Why not the others: 30 cm: The image is 30 cm behind the mirror, which is 60 cm from the object. 15 cm: That halves the distance. 90 cm: That adds three distances.

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