Which of the following quantities can be measured using only a travelling microscope?
(a) Refractive index of a glass slab
(b) Refractive index of a prism
(c) Refracting angle of a prism
(d) Refractive index of a small drop of water
Correct Answer is: (a) Refractive index of a glass slab
When the slab is placed on a flat surface, the real depth and apparent depths can be measured directly by the travelling microscope.
