A vesserl contains a slab of glass 8cm thick and of refractive index 1.6 . Over the slab,
Channel: Doubtnut
Date: 26/07/2020

A vesserl contains a slab of glass 8cm thick and of refractive index 1.6 . Over the slab, the vessel is filled by oil of refractive index `mu` upto height 4.5 cm and then by another liquid, i.e., water of refractive index `4//3` and height 6cm as shown in Figure. An observer looking down from above observer that a mark at the bottom of glass slab appears to be raised up to a position 6cm from bottom of the slab. Find refractive index of oil `(mu)` .  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_E01_049_Q01.png" width="80%"