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प्रश्न
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
उत्तर
Focal length = ½ (Radius of curvature)
Or, f = `40/2` = 20 cm
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संबंधित प्रश्न
An image which can be obtained on a screen is called a ______ image.
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 happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?
What type of image is formed:
in a plane mirror?
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
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 (a) the focal length of mirror (b) position of image.
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
What is the relationship between the focal length and radius of curvature?
