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A concave lens is placed in the path of a uniform parallel beam of light falling on a screen as shown. Then

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in the region AC and BD, the intensity will be smaller than what it would be in the absence of the lens

intensity in region AB will be smaller that what it would be in the absence of the lens

intensity of light will be the same everywhere on the screen

in the region AC and BD, the intensity will be greater than what it would be in the absence of the lens

answer is B, D.

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Detailed Solution

Note that the intensity of light in the region AB (when the lens is absent) now gets distributed over the region CD. In the regions AC and BD light intensity is due to both the direct beam and the diverged light from the lens.

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