A refracting telescope is adjusted for normal viewing with an eyepiece of focal length

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

2\,\text{cm}

. The total length of the telescope tube in this setting is

102\,\text{cm}

. If the eyepiece is replaced by another lens of focal length

4\,\text{cm}

and the tube length is kept unchanged, the new magnifying power will be (a)

-25

(b)

+50

(c)

-50

(d)

-48