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Question
The focal length of a lens is 50 cm. Its power would be ______.
Options
50 dioptres
2 dioptres
20 dioptres
none of these
MCQ
Fill in the Blanks
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Solution
The focal length of a lens is 50 cm. Its power would be 2 dioptres.
Explanation:
Power is given by $$P = \frac{100}{f\text{ (in cm)}} = \frac{100}{50} = 2\text{ dioptres}$$.
The other values arise from incorrect formulas or incorrect unit conversions.
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