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प्रश्न
Name one of the common defects of vision and the type of lens used to remove it.
उत्तर
Myopia is one of the common defects of vision because of which a person is able to see nearby objects, but not distant objects, clearly. Concave lenses are used to correct this defect.
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संबंधित प्रश्न
List some things that concave lens and concave mirror have in common.
A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?
With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.
Construct ray diagrams to illustrate the formation of a virtual image using a diverging lens.
An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Fine the position and nature of the image.
State whether the following statement is true or false:
Short-sightedness can be cured by using a concave lens.
A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses
A lens forms an image between the object and the lens. Name the lens.
State three characteristics of the image of an extended source, formed by a concave lens.
