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NEET · Physics · STD 12 - 9. Ray optics and optical instruments

दिखाए गये चित्र में, लेंसों के संयोजन की तुल्य फोकस ((\(cm\)) दूरी क्या है (सभी लेंस पतले मानकर)?

  1. A \(-50\)
  2. B \(40\)
  3. C \(-40\)
  4. D \(-100\)
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Answer & Solution

Correct Answer

(D) \(-100\)

Step-by-step Solution

Detailed explanation

\(\text { Use } \frac{1}{f}=[\mu-1]\left[\frac{1}{R_1}-\frac{1}{R_2}\right]\) \(\frac{1}{f_1}=[1.6-1]\left[\frac{1}{\infty}-\frac{1}{20}\right]=\frac{-3}{100}\)
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