JEE Main 2016 Physics question

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

(1)Two
(2)Four
(3)ThreeCorrect
(4)Five

Answer: (3)

Solution

The refractive index is found from , and three settings of the travelling microscope are needed to obtain both. **First**, focus on an ink mark on the base with no slab present and note the reading. **Second**, place the slab over the mark and refocus on the image

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Question ID VK-115605