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Standard XII
Physics
Question

To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are:
  1. Two
  2. Four
  3. Three
  4. Five

A
Three
B
Four
C
Five
D
Two
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Solution
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Reading one ⇒ without slab
Reading two ⇒ with slab
Reading three ⇒ with sawdust

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