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प्रश्न
A simple microscope is used by watch repairers. Give reason.
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उत्तर
When an object is placed within the focal length of a simple microscope, its magnified and erect image is obtained on the same side of the lens as that of the object. So, a watch repairer sees the minute parts of a watch very clearly with a simple microscope by adjusting the distance between the object and the lens. This helps in repairing the watch. Hence, a simple microscope is used by watch repairers.
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संबंधित प्रश्न
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
What is a virtual image?
A virtual image larger than the object can be produced by a ______.
What type of image is formed:
- in a plane mirror?
- on a cinema screen?
Name the two types of spherical mirrors. What type of mirror is represented by the:
- back side of a shining steel spoon?
- front side of a shining steel spoon?
A real and enlarged image can be obtained by using a
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
Define the following term in relation to concave mirror.
Principal axis
What is the relationship between the focal length and radius of curvature?
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
Complete the following diagrams shown in the following figures by drawing the reflected rays.
Define the term Pole.
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
Complete the following diagrams shown in the following figures by drawing the reflected rays.
Spherical mirrors are one form of ______ mirrors.
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
What is the focal length (f) of a mirror?
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
