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प्रश्न
How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light.
उत्तर
When rays of light come from the focus of lens, the emergent rays of light get parallel to the principal axis.
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and smaller than the object?
Take down this figure into your answer book and complete the path of the ray.
Fill in the following blank with suitable word:
A convex lens .................. rays of light, whereas a concave lens .................. rays of light.
With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.
An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is converging,
Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m, and state the nature and size of the image.
(a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from:
(i) a diverging lens of focal length 40 cm.
(ii) a converging lens of focal length 40 cm.
(b) Draw labelled ray diagrams to show the formation of images in case (i) and (ii) above (The diagrams may not be according to scale).
- Name the lens which always forms an erect and virtual image.
- State whether the image in part (a) is magnified or diminished.
Convex lens : converging : : concave lens : _______
Give two characteristics of the image formed by a concave lens.
