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प्रश्न
State one practical use each of convex mirror, concave mirror, convex lens and concave lens.
उत्तर
- A convex lens is used as a magnifying glass.
- A concave mirror is used as a shaving mirror.
- A convex mirror is used as rear view mirror in vehicles.
- A concave lens is used for correcting myopia.
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संबंधित प्रश्न
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light.
Which of the following can form a virtual image which is always smaller than the object?
(a) a plane mirror
(b) a convex lens
(c) a concave lens
(d) a concave mirror
Name one of the common defects of vision and the type of lens used to remove it.
A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses
The diagrams showing the correct path of the ray after passing through the lens are:
 |
 |
| I | II |
 |
 |
| III | IV |
A student obtained clear image of window grills on the screen. But the teacher told him to get the image of a tree far away, instead of window. To get a clear image, the lens must be ............................
Convex lens : converging : : concave lens : _______
Distinguish between Concave lens and Convex Lens.
