Question

25. Both Ram and Shyam are holding a lens in their hand. They try to read a
newspaper column through their respective lenses. The text appears magnified
and erect to Ram, but it appears diminished and erect to Shyam.
(a) State the types of lens held by Ram and Shyam.
(b) Which lens can also show the text inverted and magnified ?
(c) Suggest the arrangement of the lens and the newspaper in order to obtain
the type of image given in part (b).
(d) In which lens, the nature of the image remains the same irrespective of
the relative position of the lens and newspaper ?
(e) State one application of each kind of lens​

Answer 1

Answer:

(i) A convex lens is used (a) as a magnifying glass, and (b) in spectacles to correct hypermetropia. (ii) Concave lens is used (a) in spectacles to correct myopia, and (b) as eye lens in terrestrial telescope.

Answer 2

Answer:

a. Ram has convex lens and Sam has concave lens.

b. convex lens

c. concave lens is used in telescope and binocular convex lens is used in microscope magnifying glass and camera

d. plane mirror