An astronomical telescope has two lenses of focal powers 0.5 D and 20D . Then its magnifying power will be :
Text Solution
Verified by ExpertsThe correct answer is:
D
Here : Focal power of first lens p 1 = 0.5 D, Focal power of second lens p 2 = 20 D, Using the relation for magnifying power
m = 
= 
= 
= 40
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