1.

The disatnce between an object and a screen is 100 cm. A lens produces an image on the screen when placed at either of the two positions 40 cm apart. The power of the lens is nearly

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The disatnce between an object and a screen is 100 cm. A lens produces an image on the screen when placed at either of the two positions 40 cm apart. The power of the lens is nearly



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