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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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Question : 99
Total: 99
An astronomical telescope has a large aperture to
[2002]
reduce spherical aberration
have high resolution
increase span of observation
have low dispersion
Validate
Solution:
The resolving power of a telescope is
R
.
P
=
D
1.22
λ
where
D
=
diameter of the objective lens
λ
=
wavelength of light.
Clearly,
R
.
P
∝
D
λ
Resolving power of telescope resolution will be high if its objective is of large aperture.
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