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Q.

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

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a

d=f1-|f2|

b

d=f1-2|f2|

c

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

d

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

answer is A, B.

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Detailed Solution

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

Hence (1) and (2) are correct.

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