Question

if focal length of thin lens is - 50 cm what is the power of the lens and its nature​

Answer 1

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$p = \frac{100}{f} \\ \\ p = \frac{100}{ - 50} \\ \\ p = - 20d$

power is -20D

lens is concave

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Answer 2

Answer:

power is -20D

lens is concave...