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प्रश्न
What type of lens is used to correct
myopia?
उत्तर
Concave lenses are used to correct myopia.
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संबंधित प्रश्न
A converging lens is used to produce an image of an object on a screen,object on a screen. What change is needed for the image to be formed nearer to the lens?
(a) increase the focal length of the lens
(b) insert a diverging lens between the lens and the screen
(c) increase the distance of the object from the lens
(d) move the object closer to the lens
Fill in the following blank with suitable word:
A convex lens .................. rays of light, whereas a concave lens .................. rays of light.
Give the position, size and nature of image of formed by a concave lens when the object is placed:
anywhere between optical centre and infinity.
Construct ray diagrams to illustrate the formation of a virtual image using a converging lens,
A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.
A concave lens has focal length 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.
What kind of lens is used to correct
short-sightedness
Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam. Draw diagrams to illustrate your answer.
State two applications of a concave lens.
If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?
