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In telescope of objective diameter (2a),...

In telescope of objective diameter (2a), the radius of the central bright region `(r_0)` is

A

`(0.61 lambda""f)/(a)`

B

`(0.75 lambda""f)/(a)`

C

`(1.94 lambda""f)/(a)`

D

`(2.43 lambda""f)/(a)`

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The correct Answer is:
A
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