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प्रश्न
Give any two applications of a concave and convex mirror.
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उत्तर
- Concave mirrors:
- Concave mirrors are used while applying make–up or shaving, as they provide a magnified image.
- They are used in torches, search lights, and head lights as they direct the light to a long distance.
- Convex mirrors:
- Convex mirrors are used in vehicles as rearview mirrors because they give an upright image and provide a wider field of view as they are curved outwards.
- They are found in the hallways of various buildings including hospitals, hotels, schools, and stores. They are usually mounted on a wall or ceiling where hallways make sharp turns.
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संबंधित प्रश्न
Name the mirror that can give an erect and enlarged image of an object.
Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.
State where an object must be placed so that the image formed by a concave mirror is:
(b) at infinity.
(c) the same size as the object.
Explain why, concave mirrors are used as shaving mirrors.
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
Calculate the image distance.
An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance:
(a) 20 cm
(b) 30 cm
(c) 40 cm
(d) 50 cm
Name the lens which can concentrate sun's rays to a point and burn a hole in a piece of paper.
The image formed by a concave mirror is of the same size as the object, if the object is placed
Match the following.
| Convex mirror | Radio telescopes |
| Parobolic mirror | Rear – view mirror |
| Snell’s law | Kaleidoscope |
| Dispersion of light | sin i/sin r =μ |
| Refractive index | Rainbow |
The radius of curvature of a concave mirror whose focal length is 5cm is ______
