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प्रश्न
Define focal length.
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उत्तर
The distance between the pole and the principal focus is called the focal length (f) of a spherical mirror.
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संबंधित प्रश्न
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. |
Which type of mirror can form a real image?
Name the two kinds of spherical mirrors and distinguish between them.
How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
Define the following term:
concave mirror
What do you understand by the term real image?
Define the term Normal.
