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

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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

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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

In the human eye,the focusing is done by:

$A$ man suffering from myopia can read a book placed at $10 \ cm$ distance. For reading the book at a distance of $60 \ cm$ with relaxed vision,the focal length of the lens required will be ...... $cm$.

The near point and far point of a person are $40\,cm$ and $250\,cm$ respectively. Determine the power of the lens he/she should use while reading a book kept at a distance of $25\,cm$ from the eye $..........D$

$A$ person cannot see objects clearly placed at a distance of more than $40 \, cm$. He is advised to use a lens of power:

$A$ defective eye cannot see close objects clearly because their image is formed

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