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प्रश्न
Complete the following sentence:
A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
उत्तर
A short-sighted person cannot see distant objects clearly. Short-sightedness can be corrected by using concave lenses.
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संबंधित प्रश्न
If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ?
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.
When a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A, and (ii) lens B? Give reason for your answer.
The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be :
(a) +16 D
(b) +4 D
(c) −16 D
(d) −4 D
An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.
(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is :
In figure give below of thin concave lens, F1 and F2 are its foci, complete the path of the given ray of light after it emerges out of the lens.
Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.
Distinguish between Concave lens and Convex Lens.
