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प्रश्न
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
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उत्तर
Given:
Radius of curvature = 25 cm
To find: f =?
Solution:
f = `R/2`= `25/2`
f = 12.5 cm
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Pole
Explain the following term related to spherical lenses: focal length
We can obtain a real, enlarged and inverted image by a concave mirror.
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
A virtual image larger than the object can be produced by a ______.
Does the mirror mentioned in part (b) form real image for all locations of the object?
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
Define the following term:
concave mirror
A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
