Which type of lens is used to correct hypermetropia (far-sightedness) ?
Convex lens
Hypermetropia (far-sightedness) is a defect of vision in which a person sees distant objects clearly but cannot see nearby objects distinctly. The near point of the eye moves farther than the normal 25 cm.
It arises because the focal length of the eye lens becomes too long or the eyeball becomes too short, so the image of a nearby object forms behind the retina.
A converging lens of suitable power placed in front of the eye bends the rays inward before they enter the eye, so the image shifts forward onto the retina. A converging lens is a convex lens and has positive power.
A concave (diverging) lens corrects myopia, a bifocal lens is used for presbyopia where both near and far vision are affected, and a cylindrical lens corrects astigmatism.
Convex lens option is correct.
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Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
The power of a lens is -2.5 D. The type of lens and its focal length are respectively:
