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In image formation from spherical mirrors, only paraxial rays are considered because they
  • a)
    are easy to handle geometrically
  • b)
    contain most of the intensity of the incident light
  • c)
    form nearly a point image of a point source
  • d)
    show minimum dispersion effect.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In image formation from spherical mirrors, only paraxial rays are cons...
Paraxial rays are ones which originate from a point source and make a small angle with the principal axis. After reflection, they give a point image, either real or virtual.
But if rays from point source that are far from the mirror axis, gives a blurred image, an effect called spherical aberration.
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Most Upvoted Answer
In image formation from spherical mirrors, only paraxial rays are cons...
Paraxial rays are ones which originate from a point source and make a small angle with the principal axis. After reflection, they give a point image, either real or virtual.
But if rays from point source that are far from the mirror axis, gives a blurred image, an effect called spherical aberration.
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Community Answer
In image formation from spherical mirrors, only paraxial rays are cons...
Paraxial rays are ones which originate from a point source and make a small angle with principle axis. After reflection, they give a point image, either real or virtual.
But if rays from point source that are far from the mirror axis, gives a blurred image, an effect called as spherical aberration.

So, correct answer is "form nearly a point image of a point source"...

$$Hope it's help... $$
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