સમાન 25 cm કેન્દ્રલંબાઈવાળા બહિર્ગોળ લેન્સ અને અંતર્ગોળ લેન્સના સંયોજનનો પાવર શું છે?

A શૂન્ય
B 25D
C અનંત
D 8D

Verified Solution

Answer & Solution

Correct Answer

(A) શૂન્ય

Step-by-step Solution

Detailed explanation

બહિર્ગોળ લેન્સનો પાવર: \( P_1 = \frac{1}{f_1} = \frac{1}{+0.25 \text{ m}} = +4 \text{ D} \) અંતર્ગોળ લેન્સનો પાવર: \( P_2 = \frac{1}{f_2} = \frac{1}{-0.25 \text{ m}} = -4 \text{ D} \)

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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