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प्रश्न
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
उत्तर
converging lenses
Converging lenses are used to correct the defect of vision and enable the person to see nearby objects clearly.
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संबंधित प्रश्न
An object 2 cm tall stands on the principal axis of a converging lens of focal length 8 cm. Find the position, nature and size of the image formed if the object is:
(i) 12 cm from the lens
(ii) 6 cm from the lens
State one practical application each of the use of such a lens with the object in position (i) and (ii).
Fill in the following blank with suitable word:
Lenses refract light to form images: a..................... lens can form both real and virtual images, but a diverging lens forms only ...................... images.
Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
Give the position, size and nature of image of formed by a concave lens when the object is placed:
at infinity.
How would a pencil look like if you saw it through
a concave lens Is the image real or virtual?
Construct ray diagrams to illustrate the formation of a virtual image using a diverging lens.
An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.
An object is 2 m from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?
What kind of lens is used to correct
short-sightedness
The diagrams showing the correct path of the ray after passing through the lens are:
 |
 |
| I | II |
 |
 |
| III | IV |
