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प्रश्न
A lens used as a magnifying glass
- is a diverging lens
- produces a virtual image
- is placed with the object nearer the lens than the principal focus
पर्याय
(i) alone
(ii) alone
(i) and (ii) only
(ii) and (iii) only
(i), (ii) and (iii)
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उत्तर
(ii) and (iii) only
Explanation:
A magnifying glass uses a convex (converging) lens, so statement (i) “is a diverging lens” is false.
For a magnifying glass, the object is placed between the optical centre and the principal focus of the convex lens. In this position, the lens forms a virtual, erect and magnified image.
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संबंधित प्रश्न
A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.
For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of the convex lens is ______.
In the following diagram , the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.
In fig., a real image of a point objert O is formed, Which of the following statements is true about each of the arrangements?
- The object is at the principle focus of the lens.
- The focal length of the lens is 17 cm.
- If the mirror is moved so that it is 6 cm from the lens image will also move.
How will you differentiate between a convex and a concave lens by looking at a printed page?
Complete the following diagram and state what happens to the ray of light after refraction through the lens.
In the following diagram, L1 and L2 are the two convex lense placed at separation equal to the sum of focal lengths of the two lenses. A and B are the two rays of light incident on the lens L1. Complete the path of rays till they emerge out of the lens L2.
What principles have you used in completing the diagram?
Mixture of red + blue + green is passed through a convex lens as shown in the diagram below. State whether the ray passes through a single point or through different points on the principal axis after refraction.
