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QJEEM20Ph0dd7: JEE Main 2020 Physics - Class 12 JEEM20Ph0dd7 Solution: The magnifying power of a telescope with tube 60 cm is 5. What…
The magnifying power of a telescope with tube 60 cm is 5. What is the focal length of its eye piece ?
Multiple Choice Options
- A 40 cm
- B 10 cm
- C 30 cm
- D 20 cm
Step-by-Step Verified Solution
For telescope
Tube length (L) = f0 + fe
and magnification (m) = = 5
where fo and fe are focal length of objective and eyepiece.
f0 + fe = 60
fo = 50 cm
fe = 10 cm
Tube length (L) = f0 + fe
and magnification (m) = = 5
where fo and fe are focal length of objective and eyepiece.
f0 + fe = 60
fo = 50 cm
fe = 10 cm