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A diverging lens of focal length f(1) is...

A diverging lens of focal length `f_(1)` is placed in front of and coaxially with a concave mirror of foacl length `f_(2)`. Their separation is d. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. Then,

A

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

B

`d=2|f_(2)|-|f_(1)|`

C

`d=|f_(2)|-|f_(1)|`

D

if the entire arrrangement is immersed in water, the conditions will remain unaltered

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The correct Answer is:
A, B
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