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प्रश्न
What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.
उत्तर
A spherical mirror is a curved surface in which the inner or outer surface has the capability to reflect light.
Difference between convex and concave mirror are as follows:
| Convex Mirror | Concave Mirror |
| 1.In a convex mirror, reflection of light takes place on the bulged-out surface. |
1.In a concave mirror, reflection of light takes place on the bent surface . |
| 2. Convex mirror has virtual focus. | 2. Concave mirror has real focus. |
| 3. Convex mirror diverges the rays of light incident on it. | 3. Concave mirror converges the rays of light incident on it. |
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संबंधित प्रश्न
Find the focal length of a concave mirror whose radius of curvature is 32 cm.
Fill in the following blank with suitable word:
The focal length of a concave mirror is the distance from the ......... to the mirror.
If an object is placed at the focus of a concave mirror, where is the image formed?
The real image formed by a concave mirror is smaller than the object if the object is:
(a) between centre of curvature and focus
(b) at a distance greater than radius of curvature
(c) at a distance equal to radius of curvature
(d) at a distance equal to focal length
An object 3 cm high is placed at a distance of 10 cm in front of a converging mirror of focal length 20 cm. Find the position, nature, and size of the image formed.
If the object is moved further away from the mirror, what changes are there in the position and size of the image?
What would your image look like if you stood close to a large:
concave mirror?
The diagram shows a dish antenna which is used to receive television signals from a satellite. The antenna (signal detector) is fixed in front of the curved dish.
Figure
(a) What is the purpose of the dish?
(b) Should it be concave or convex?
(c) Where should the antenna be positioned to receive the strongest possible signals?
(d) Explain what change you would expect in the signals if a larger dish was used.
With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
For a real object, which of the following can produce a real image?
