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प्रश्न
Distinguish between a real and a virtual image.
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उत्तर
| Real image | Virtual image |
| 1. A real image is formed due to actual intersection of refracted (or reflected) rays | 1. A virtual image is formed when the refracted (or reflected) rays meet if they are produced backwards |
| 2. 2 A real image can be obtained on a screen | 2. 2. A virtual image cannot be obtained on a screen |
| 3. 3. A real image is inverted with respect to the object. | 3. 3. A virtual image is erect with respect to the object |
संबंधित प्रश्न
What is a lens?
Explain optical centre of a lens with the help of proper diagram(s).
Study the diagram shown in the following Figure.
Name the lens LL’ and draw its outline.
The diagram given below shows the position of an object OA in relation to a converging lens whose foci are at F1 and F2.
Describe how the distance of the image from the lens and the size of the image change as the object is moved towards F1.
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
Define the term focus of a lens.
A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on the other side of it. Name the kind of lens.
State the nature and position of the object on the principal axis to obtain a real and magnified image.
Draw a ray diagram to show the image formed by a convex lens when the object is placed between F and 2F.
