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In a reflecting astronomical telescope, ...

In a reflecting astronomical telescope, if the objetcive (a spherical mirror) is replaced by a parabolic mirror of the same focal length and aperture, then

A

the final image will be erect

B

the large image will be obtained

C

the telescope will gather more light

D

spherical aberration will be absent

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The correct Answer is:
D
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CP SINGH-OPTICAL INSTRUMENTS-EXERCISES
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  10. The resolving power of an astronomical telescope is 0.2 seconds. If th...

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  11. The angular resolution of a 10cm diameter telescope at a wavelength 50...

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