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प्रश्न
Point out the difference between a convex lens and a concave lens.
उत्तर
| Convex Lens | Concave Lens | ||
| 1. | It is thicker at the centre and thin at the ends. | 1. | It is thinner at the centre and thick at the ends. |
| 2. | It converges rays of light. | 2. | It diverges rays of light. |
| 3. | It has a real focus. | 3. | It has a virtual focus. |
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संबंधित प्रश्न
If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed?
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A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.
(A) The device X is a convex lens of focal length 20 cm.
(B) The device X is a concave mirror of focal length 40 cm.
(C) The device X is a convex mirror of radius of curvature 40 cm.
(D) The device X is a convex lens of focal length 40 cm.
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