An astronomical telescope has an eyepiece of focal-length 5 cm. If the angular magnification in normal adjustment is 10, when final image is at least distance of distinct vision (25cm) from eye piece, then angular magnification will be :
Text Solution
Verified by ExpertsThe correct answer is:
B
For normal adjustment
m = – 
When final image is at least distance of distinct vision from eyepiece,
m' = – 
= 
= 12
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