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प्रश्न
What kind of lens is used to correct
short-sightedness
उत्तर
Concave lenses are used to correct short-sightedness.
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संबंधित प्रश्न
State whether concave lens has a real focus or a virtual focus.
Draw a diagram to show how a converging lens focusses parallel rays of light?
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).
Copy and complete the diagram below to show what happens to the rays of light when they pass through the concave lens:
What is the difference between the two images formed above?
A concave lens forms the image of an object which is ______.
At what distance from a concave lens of focal length 20 cm a 6 cm tall object be placed so as to obtain its image at 15 cm from the lens? Also calculate the size of the image formed.
Draw a ray diagram to justify your answer for the above situation and label it.
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is :
State three characteristics of the image of an extended source, formed by a concave lens.
Do we expect any change in the position, nature, and size of the image
(i) formed by a concave lens,
(ii) with a change in the position of the object?
