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प्रश्न
What is the relationship between the focal length and radius of curvature?
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उत्तर
The relationship between the focal length, f, and radius of curvature, r is
f = 1/2 x r.
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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. |
What kind of mirror is required for obtaining a virtual image of the same size as the object?
A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
A real and enlarged image can be obtained by using a
The spherical mirror used as a rear view mirror in the vehicle is
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
