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प्रश्न
Differentiate convex lens and concave lens.
उत्तर
| Convex Lens | Concave Lens |
| 1. The lens which is thicker at the centre than at the edges. | 1. The lens is thinner at the centre than at the edges. |
| 2. Abeam of light passing through it, is converged to a point. | 2. A beam of light passing through it is diverged or spread out. |
| 3. It is called a converging lens. | 3. It is called a diverging lens. |
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संबंधित प्रश्न
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?
An object AB is placed between O and F1 on the principal axis of a converging lens as shown in the diagram.
Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB.
Explain with the help of a diagram, why the convex lens is also called a converging lens.
What kind of lens can form:
an inverted magnified image?
Yesh find out F1 and F2 of symmetric convex lens experimentally then which conclusion is true.
Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.
State the position of object, position of image, nature of image when: Convex lens is used as an erecting lens in terrestrial telescope.
Distinguish between:
Concave lens and Convex Lens
