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प्रश्न
The focal length of a lens is 50 cm. Its power would be ______.
पर्याय
50 dioptres
2 dioptres
20 dioptres
none of these
MCQ
रिकाम्या जागा भरा
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उत्तर
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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