MHT CET · Physics · Ray Optics
An object is clearly seen through an astronomical telescope of length \(50 \mathrm{~cm}\). The
focal lengths of its objective and eyepiece respectively, can be
- A \(5 \mathrm{~cm}\) and \(45 \mathrm{~cm}\)
- B \(45 \mathrm{~cm}\) and \(-5 \mathrm{~cm}\)
- C \(-45 \mathrm{~cm}\) and \(-5 \mathrm{~cm}\)
- D \(45 \mathrm{~cm}\) and \(5 \mathrm{~cm}\)
Answer & Solution
Correct Answer
(D) \(45 \mathrm{~cm}\) and \(5 \mathrm{~cm}\)
Step-by-step Solution
Detailed explanation
(A)
\(\ell=f_{0}+f_{e} ; \quad f_{0}\) and \(f_{0}\) are positive.
Magnifying power \(=\frac{f_{0}}{f_{e}}>1\)
\(\ell=f_{0}+f_{e} ; \quad f_{0}\) and \(f_{0}\) are positive.
Magnifying power \(=\frac{f_{0}}{f_{e}}>1\)
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