JEE Advanced Model Paper 7 with solutions for online practice

The curvature radii of concavo-convex glass lens are 60 cm and 20 cm. The convex surfaceof the lens is silvered with the lens horizontal, the concave surface is filled with water. Thefocal length of the effective mirror is

10x

13

cm . Then x = ... (µw=

4

3

;µg=

3

2

)