Inability of a lens to bring all the rays coming from a point object to focus at one single point is called:

Spherical aberration

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Parallex

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Optical illusion

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None of these

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Solution

The correct option is A Spherical aberration
Spherical aberration is an optical effect observed in an optical device (lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the centre. Due to it, the image of a point object is spread in a region instead of being focussed at a point.

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Similar questions

Q. The inability of a lens to bring all the rays coming from a point object to focus at one single point is called

Q. Assertion :A convex lens suffers from chromatic aberration. Reason: All parallel rays of monochromatic light passing through a convex lens do not come to a
focus at the same point

FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge..

BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

Q. Parallel rays of light, falling on a concave lens, appear to diverge from a point

(a) at infinity
(b) at twice focal length
(c) at the focus
(d) between focus and the lens

Q. A simple telescope, consisting of an objective of focal length

60 c m

and a single eye lens of focal length

5 c m

is focused on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle

2^{o}

at the objective, the angular width of the image:

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