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प्रश्न
A converging lens has a focal length of 50 cm. The power of this lens is:
पर्याय
+0.2D
−2.0D
+2.0D
−0.2D
उत्तर
+2.0 D
Power `=1/"focal length"=1/0.5=+2D`
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संबंधित प्रश्न
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