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A windwo fitted with a wire mesh and dis...

A windwo fitted with a wire mesh and distant 200 m is being viewed with the help of telescope. The spacing between the wires of the mesh is 2 mm. The wavelengths of light used is 5000Å . The minimum diamtere telescop must be

A

`6.1 cm`

B

`5.9 cm`

C

`4.2 cm`

D

`3.6 cm`

Text Solution

Verified by Experts

The correct Answer is:
A
`(d)/(x)=(1.22lamda)/(D)`
`:.D=(1.22xx5xx10^(-7)xx2xx10^(2))/(2xx10^(-3))=6.1xx10^(-2)m`
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