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  4. To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :

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Q. To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :

JEE MainJEE Main 2016Ray Optics and Optical Instruments

Solution:

Reading one $\Rightarrow $ without slab
Reading two $\Rightarrow $ with slab
Reading three $\Rightarrow $ with sawdust