the refractive index of the liquid in order to mark the lens disappear

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Gupta Ravi

A glass lens of refractive index 1.5 is placed in a trough of liquid. What must be the refractive index of the liquid in order to mark the lens disappear?

Refractive index of liquid should be 1.5. Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.