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A concave lens is placed in the path of convergent rays. The rays are focussed on the axis 15 cm behind the lens. Where would these rays have been foc

Monjur Alahi

A concave lens is placed in the path of convergent rays. The rays are focussed on the axis 15 cm behind the lens. Where would these rays have been focussed in the absence of the lens ? Focal length of the lens is 30 cm.


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Salim Ahmed Kawsar

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Correct Answer - At a distance of 10 cm behind the lens

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Correct Answer - 0.075m

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Correct Answer - The image coincides with the object

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Correct Answer - 140 cm in front of the lens

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Correct Answer - [9I]

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Correct Answer - [0.1 mm]

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Correct Answer - 10 cm from the lens

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Correct Answer - (ii) `+14.3cm` (ii) `-14.8cm` (iv) `-27`

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Correct Answer - Infinite, zero

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Correct Answer - 10 cm, 10D

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