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Q.

A diverging lens of focal length f1 is placed in front of and coaxially with a concave mirror of focal length f2. Their separation is d. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. Select the correct statement(s).

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a

The beam diameters of the incident and reflected beams must be the same.

b

d=2|f2|-|f1|

c

d=|f2|-|f1|

d

If the entire arrangement is immersed in water, the conditions will remain unaltered.

answer is A, B.

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Detailed Solution

A diverging lens of focal length f1 is placed in front of an coaxially with a  concave mirror of focal length f2 . Their separation is d . A parallel beam  of
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