JEE Main 2015 Physics question
A telescope has an objective lens of focal length cm and an eyepiece of focal length cm. If a m tall tower at a distance of km is observed through this telescope in a normal setting, the angle formed by the image of the tower is , then is close to
Answer: (4)
Solution
The angle the tower itself subtends at the objective is rad. In normal adjustment the angular magnification is . The image therefore subtends $θ = Mα = 30
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