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प्रश्न
उत्तर
| Convex lens | Concave lens |
| 1. A convex lens is thicker in the middle and thinner at its edges. | 1. A concave lens is thicker at the edges and thinner in the middle. |
| 2. A light beam converges on passing through a convex lens. | 2. A light beam diverges on passing through a concave lens. |
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संबंधित प्रश्न
Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:
if it hits the glass block at 90° (that is, perpendicular to the glass block)
Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:
if it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).
Fill in the following blank with suitable word:
The image in a convex lens depends upon the distance of the ........... from the lens.
List some things that convex lens and concave mirror have in common.
Which of the above two cases illustrates the working of a magnifying glass?
A student did an experiment with a convex lens. He put an object at different distances 25 cm, 30 cm, 40 cm, 60 cm and 120 cm from the lens. In each case he measured the distance of the image from the lens. His results were 100 cm, 24 cm, 60 cm, 30 cm and 40 cm, respectively. Unfortunately his results are written in wrong order.
What is the focal length of this lens?
A convex lens is placed in water. Its focal length will ______.
Point out the difference between a convex lens and a concave lens.
What happens to the image formed by a convex lens if its lower part is blackened?
Can a normal convex lens behave like a concave lens and vice-versa?
