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Question
State two differences between a convex and a concave lens.
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Solution 1
| Convex lens | Concave lens | |
| 1. | A convex lens can form both real and virtual images | A concave lens always forms a virtual image |
| 2. | It can form a magnified image. | The image is always diminished in size. |
Solution 2
1) A convex lens is thicker in the middle, while a concave lens is thinner in the middle.
2) A convex lens converges the light ray falling on it, while a concave lens diverges the light ray falling on it.
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RELATED QUESTIONS
Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the:
(a) lens slightly towards the screen
(b) lens slightly away from the screen
(c) lens slightly towards the sun
(d) lens and screen both towards the sun
A concave lens always forms a virtual image.
A real image cannot be obtained on a screen.
Which type of lens forms always a virtual image?
Write the new Cartesian sign convention for spherical lenses.
If a spherical lens has a power of, −0.25 D, the focal length of this lens will be :
(a) −4 cm
(b) −400 mm
(c) −4 m
(d) −40 cm
What are the three principal rays that are drawn to construct the ray diagram for the image formed by a lens? Draw diagrams to support your answer.
Complete the ray diagram to show how the rays pass into and out of the lens?
Which diagram shows image formation of an object on a screen by a converging lens?
Complete the following table for convex lens:
| Sr. No. | Position of the object | Position of the image | Nature of the image |
| 1. | Beyond 2F1 | __________________ | ________________________ |
| 2. | __________________ | At infinity | ________________________ |
| 3. | __________________ | __________________ | Real, inverted and enlarged |
