NEET · Physics · STD 12 - 9. Ray optics and optical instruments
In the figure shown here, what is the equivalent focal length (in \(cm\)) of the combination of lenses (Assume that all layers are thin)?
- A \(-50\)
- B \(40\)
- C \(-40\)
- D \(-100\)
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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