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प्रश्न
The focal lengths of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having the greatest power is:
पर्याय
P
Q
R
S
MCQ
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उत्तर
R
Explanation:
Power = `1/"focal length"`
Therefore, a lens with a small focal length will have more power.
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