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प्रश्न
Name two factors on which the focal length of a lens depends.
उत्तर
Focal length depends on :
(1) Curvature of the lens
(2) Material medium of the lens
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संबंधित प्रश्न
An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.
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Draw diagram to show how a convex mirror can be used to give a large field of view.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
Write true or false
The focal length of a convex mirror is equal to its radius of curvature.
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Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.
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