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Question

The image of a star is formed by a convergent lens of focal length 1 m and diameter 5 cm. If the lens is ideal and the effective wavelength in image formation is taken as 5×105 cm, the diameter of the image formed will be nearest to

A
Zero
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B
2.5×106 cm
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C
2.5×105 cm
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D
2.5×103 cm
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