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प्रश्न
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
विकल्प
MW
MS
SW
MW-WS
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उत्तर
MS
Explanation:
The focal length of a concave mirror is the distance between its pole and principal focus.
That is, the distance of the image formed (screen) from the concave mirror will be equal to the focal length of the concave mirror.
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संबंधित प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
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. |
Name the two types of spherical mirrors. What type of mirror is represented by the:
back side of a shining steel spoon?
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
For what position of object, the image formed by a concave mirror is magnified and erect?
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
Define the term Focus of a concave mirror.
Define focal length.
