Question

Read the given text and answer the following questions:
Rajesh is a student of class X and Ram is studying in class VII. Rajesh told Ram that he would show a magic to him. Rajesh had a lens. He focused the rays of sunlight on the bare arm of Ram. After few seconds, Ram felt pain and removed his arm away. Rajesh was laughing at Ram.
1. Name the type of lens used by Rajesh.
(a) Concave lens
(b) Convex lens
(c) Plano-concave lens
(d) Can be both concave and convex lens
2. Where the object is placed in front of lens in the given case:
(a) At focus
(b) At infinity
(c) Between pole and focus
(d) Beyond C
3. If Ram’s arm is at a distance of 17 cm from the lens , what is its centre of curvature (a) 17 cm
(b) 34 cm
(c) 8.5 cm
(d) None of these
4. What can be said about the size of the image?

(a) Very large
(b) Highly diminished
(c) Equal to the object
(d) None of these
5. What can you say about the nature of image formed in this case?
(a) Virtual and erect image
(b) Real and inverted image
(c) Virtual and inverted image
(d) Real and erect image

Answer 1

Answer:

1 ) Convex Lens

2 ) At focus

3 ) 34 cm

4 ) Highly diminished

5 ) Real and inverted .