Two lenses of focal lengths 5 cm and 50 cm are to be used for making a telescope. Which lens will you use for the objective?(a) Both(b) Neither(c) 5 cm(d) 50 cmThe question was posed to me in final exam.Origin of the question is Optical Instruments in section Ray Optics and Optical Instruments of Physics – Class 12

Two lenses of focal lengths 5 cm and 50 cm are to be used for making a

1.	Two lenses of focal lengths 5 cm and 50 cm are to be used for making a telescope. Which lens will you use for the objective?(a) Both(b) Neither(c) 5 cm(d) 50 cmThe question was posed to me in final exam.Origin of the question is Optical Instruments in section Ray Optics and Optical Instruments of Physics – Class 12
Answer» The correct CHOICE is (d) 50 cm Easiest EXPLANATION: In a telescope, the objective should have a LARGE focal length than the eyepiece. So the LENS of 50 cm focal length will be used as the objective. So, the SMALLER one of the two, i.e. the 5 cm focal length lens will be used as the eyepiece.

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