Question

1. An astronomical telescope has an objective of
focal length 100 cm and an eye piece of focal
length 5 cm. The final image of a star is seen
25 cm from the eyepiece. The magnifying power of
the telescope is​

Answer 1

Answer:

m = 24

Explanation:

m = f' / f" [ 1 + f" / d ]           ( f' -- objective  ;  f" -- eyepiece  )

   = 100 / 5 [ 1 + 5 / 25 ]

   = 20 [ 1.2 ]

m = 24