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Question
Distinguish between a real and a virtual image.
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Solution
| 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 |
RELATED QUESTIONS
In the following figure (a) and (b), F1 and F2 are positions of the two foci of thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.
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| (a) |
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| (b) |
The diagram given below shows the position of an object OA in relation to a converging lens L whose foci are at F1 and F2.
- Draw two rays to locate the position of the image.
- State the position of the image with reference to the lens.
- Describe three characteristics of the image.
- Describe how the distance of the image from the lens and its size change as the object is moved towards F1.
State the condition of the following:
A lens has both its focal lengths equal.
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 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.
Make the correct choices in the following items :
The image formed by a diverging lens, shown in fig, , is
How will you differentiate between a convex and a concave lens by looking at a distant object.
Complete the following diagram and state what happens to the ray of light after refraction through the lens.
