JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Two convex lenses of focal length \(20\,cm\) each are placed coaxially with a separation of \(60\,cm\) between them. The image of the distant object formed by the combination is at \(...........\,cm\) from the first lens.
- A \(99\)
- B \(98\)
- C \(93\)
- D \(100\)
Answer & Solution
Correct Answer
(D) \(100\)
Step-by-step Solution
Detailed explanation
\(1^{\text {st }}\) refraction in \(L _1\left( I _1\right)\) \(\frac{1}{ v }-\frac{1}{ u }=\frac{1}{ f }\) \(\frac{1}{ v }-\frac{1}{\infty}=\frac{1}{ f }\) \(\therefore v = f\) \(2^{2 dr } \text { refraction in } L _2\) \(I _1 \rightarrow \text { object }\)…
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