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Diameter of objective of a telescope is ...

Diameter of objective of a telescope is 10 cm Its distance from two different objects is 1 km If wavelength of light is 5000 Å, then at wha minimum distance, these objects are clearl seen by telescope ?

A

5 cm

B

0.5 m

C

5 m

D

5 mm

Text Solution

Verified by Experts

The correct Answer is:
D
Here ,`(x)/(1000)=(1.22lambda)/(D)`
or `x=(1.22xx5xx10^3xx10^(-10)xx10^3)/(10xx10^(-2))`
`=1.22xx5xx10^(-3)`m =6.1 mm
which is order of 5 mm for x.
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