એસ્ટ્રોનોમિકલ ટેલિસ્કોપના ઓબ્જેકિટવ અને આઇપીસની કેન્દ્રલંબાઇ અનુક્રમે \( 40 \;cm\) અને \( 4\; cm \) છે. ઓબ્જેકિટવથી \(200 \; cm\) દૂર રહેલી કોઈ વસ્તુને જોવા માટે, બંને લેન્સો વચ્ચેનું અંતર (\(cm\) માં) કેટલું હોવું જોઇએ?

A \(46\)
B \(50\)
C \(54\)
D \(37.3 \)

Verified Solution

Answer & Solution

Correct Answer

(C) \(54\)

Step-by-step Solution

Detailed explanation

Here \(f_{o}=40\, \mathrm{cm}\), \(f_{e}=4 \,\mathrm{cm}\) Tube length( \((l)=\) Distance between lenses \(=v_{o}+f_{e}\) For objective lens,

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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