Correct Answer: Option B

Explanation

\(\frac{1}{\text{f}}\) = \(\frac{1}{\text{u}}\) + \(\frac{1}{\text{v}}\)

\(\frac{1}{\text{f}}\) = \(\frac{1}{25}\) + \(\frac{1}{-50}\)

u = 25cm, v = - 50cm

\(\frac{1}{\text{f}}\) = \(\frac{1}{u}\) - \(\frac{1}{50}\) = \(\frac{2 - 1}{50}\) 

f = 50cm

P = \(\frac{1}{\text{f}}\)  = \(\frac{1}{50}\)  = 0.02cm. ( in dioptres = 2D)

1D = 1m\(^{-1}\)

There is an explanation video available below.

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