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OCEAN GODRE Grade: 12
        

an image of axial poin source is made with a parabolic mirror which is front coated.the image will be free of which of the following


a.chromatic abberation


b.spherical abberation


c.coma


d.astimatism

6 years ago

Answers : (1)

AJIT AskiitiansExpert-IITD
68 Points
										

Dear  ocean ,


Coma is the inherent problem in the parabolic mirror. When a bundle of parallel rays from a star strikes the parabolic mirror at an angle, the star image is formed off the optical axis, or decentered in the field of view . The parabola does not reflect this bundle of angled rays to a perfect point. Instead, the star appears as a bright spot with a V-shaped comatic flare .


parabolic mirror removes the  a, b, d option.


 Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.


All the best.


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Askiitians Expert


Ajit Singh Verma IITD


 

6 years ago
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