What focal length should the reading spectacles have for a person whose near point is `50cm` ? (NCERT Solved Example)

What focal length should the reading spectacles have for a person whose near point is 50 cm ?

What focal length should the reading spectacles have for a person whose near point is 50 cm ?

What focal length should the reading spectacles have for a person for whom the least distance of vision is 50 cm ? (The distance of Normal vision is 25cm).

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm ?

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?

Find the focal length of the lenses used in spectacles of a person if the power of the spectacles is 0.5D.

A short sighted person can see objects most distinctly at a distance of 16 cm . If he wears spectacles at a distance of 1 cm from the eye, what focal length should he have so as to enable him to see distinctly at a distance of 26 cm ? ( c) The person above prefers to remove his spectacles while reading a book. Explain why ? (NCERT Solved Example)

A thin convex lens of focal length 5 cm is used as a simple microscope by a person with normal near point (25"cm") . What is the magnifying power of the microscope.?

A thin convex lens of focal length 5 cm is used as a simple microscope by a person with normal near point (25 cm). What is the magnifying power of the microscope ?