JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
A convex lens, of focal length \(30\,cm,\) a concave lens of focal length \(120\,cm,\) and a plane mirror are arranged as shown. For an object kept at a distance of \(60\,cm\) from the convex lens, the final image, formed by the combination, is a real image, at a distance of
- A \(60\,cm\) from the convex lens
- B \(60\,cm\) from the concave lens
- C \(70\,cm\) from the convex lens
- D \(70\,cm\) from the concave lens
Answer & Solution
Correct Answer
(A) \(60\,cm\) from the convex lens
Step-by-step Solution
Detailed explanation
Len's formula is given by \(\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\) For convex lens, \(\frac{1}{30}=\frac{1}{v}+\frac{1}{60} \Rightarrow \frac{1}{60}=\frac{1}{v}\) Similarly for concave lens \(\frac{1}{-120}=\frac{1}{v}-\frac{1}{40} \Rightarrow \frac{1}{v}=\frac{1}{60}\) Virtual…
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