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प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
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उत्तर
Centre of Curvature:-
The centre of sphere of part of which a lens is formed is called the centre of curvature of the lens. Since concave and convex lenses are formed by the combination of two parts of spheres, therefore they have two centres of curvature. One centre of curvature is usually denoted by C1 and second is denoted by C2.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Centre of curvature
State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.
Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it. Find:
- the focal length of the mirror
- position of image
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
