27 A microscope is focused on a mark then a glass slab of

Last updated: 6/28/2023

27 A microscope is focused on a mark then a glass slab of refractive index 1 5 and thickness of 6 cm is placed on the mark to get the mark again in focus the microscope should be moved 1 4 cm 2 2 cm 3 6 cm 4 8 cm