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Physics · PYQ NEET UG 2016(1)
हिन्दीA astronomical telescope has objective and eyepiece of focal length \( 40\text{ cm} \) and \( 4\text{ cm} \) respectively. To view an object \( 200\text{ cm} \) away from the objective, the lenses must be separated by a distance
Correct answer · Option 3
\( 54.0\text{ cm} \)
Explanation
Using lens formula for objective: \( \frac{1}{v_o} - \frac{1}{-200} = \frac{1}{40} \Rightarrow v_o = 50\text{ cm} \). For normal adjustment or general setup, eyepiece focuses at infinity or specific distance, but here separation is \( v_o + f_e = 50 + 4 = 54\text{ cm} \).
