Question

Tom’ lenses of focal lengths ± 15 cm and ± 150 cm are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be
(a) + 15 cm
(b) + 150 cm
(c) – 150 cm
(d) – 15 cm

Answer 1

Answer:

b) +150cm................✔

Answer 2

Answer:

a) +15 cm

Explanation:

For telescope magnification,

m=f0/fe

Hence fe<fo to produce large magnification

fe-----> minimum