A far-sighted man who has lost his spectacles | vedclass

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Question

(C) far-sighted person suffers from hypermetropia,meaning they cannot see nearby objects clearly because the image forms behind the retina.By looking

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Because in doing so,the focal length of the eye lens is effectively decreased

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(C) far-sighted person suffers from hypermetropia,meaning they cannot see nearby objects clearly because the image forms behind the retina.By looking through a small hole (a pinhole),the person effectively increases the depth of focus of their eye.This reduction in the aperture of the eye allows the light rays to enter more parallel to the optical axis,which reduces the blur circle on the retina.Effectively,this acts like a convex lens,allowing the eye to focus on closer objects by decreasing the required accommodation power,which is equivalent to an effective decrease in the focal length of the eye's optical system to bring the image onto the retina.

$A$ far-sighted man who has lost his spectacles reads a book by looking through a small hole $(3-4 \,mm)$ in a sheet of paper. The reason is:

Similar Questions

$A$ man cannot see clearly the objects beyond a distance of $20 \, cm$ from his eyes. To see distant objects clearly,he must use which kind of lenses and of what focal length?

$A$ person has a near point of $50\, cm$. What lens should they use to reduce it to $25\, cm$?

The near point and far point of a normal human eye are respectively:

When the human eye is focused on an object,the ciliary muscles are least strained when the object is at:

For a normal eye,the least distance of distinct vision is......$m$.

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