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

Options

  1. ATwo
  2. BFour
  3. CThree
  4. DFive

Correct answer

C. Three

Step-by-step solution

Reading one ⇒ without slab Reading two ⇒ with slab Reading three ⇒ with Lycopodium powder

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