The curvature radii of a concavo-convex glass lens are 20 ~cm and 60 ~cm . The convex…
Physics · JEE Main · NTA Exams — Optics
The curvature radii of a concavo-convex glass lens are \(20 \mathrm{~cm}\)and \(60 \mathrm{~cm}\). The convex surface of thelens is
silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is \((\mu\) of glass \(=1.5, \mu\) of water \(4 / 3)\)
silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is \((\mu\) of glass \(=1.5, \mu\) of water \(4 / 3)\)
- \(90 / 13 \mathrm{~cm}\)
- \(80 / 13 \mathrm{~cm}\)
- \(20 / 3 \mathrm{~cm}\)
- \(45 / 8 \mathrm{~cm}\)
Answer
(A) 90 / 13 ~cm
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