Correct Answer: Option D

Explanation

M = \(\frac{v}{u}\) = 3 = \(\frac{v}{30}\). V = 30m

\(\frac{1}{u}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\) = \(\frac{1}{10}\) - \(\frac{1}{30}\) = \(\frac{1}{f}\)

\(\frac{3 - 1}{30}\) = \(\frac{1}{f}

f = \(\frac{30}{2}\) = 15cm

There is an explanation video available below.

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