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QNEET-2016-Ph-1081: NEET 2016 Physics - Class 12 NEET-2016-Ph-1081 Solution: A astronomical telescope has objective and eyepiece of focal…
A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective the lenses must be separated by a distance 50.0 cm 54.0 cm 37.3 cm 46.0 cm
Multiple Choice Options
- A 50.0 cm
- B 54.0 cm
- C 37.3 cm
- D 46.0 cm
Step-by-Step Verified Solution
Given: Focal length of objective, f 0 = 40cm
Focal length of eye�piece f e = 4 cm
image distance, u 0 = 200 cm
Using lens formula for objective lens
1 v 0 _ 1 u 0 = 1 f 0
1 v 0 _ 1 _ 200 = 1 40
_ 1 v 0 = 1 40 _ 1 200 = 4 200
_ v 0 = 50 cm
Tube length( l ) = Distance between lenses = v o + f e = 50 + 4 = 54 cm