MCQ
Which of the following solid substance$(s)$ will have the same refractive index when measured in different directions?
  • A
    Rubber
  • $\text{NaCl}$
  • C
    Plastic
  • D
    Graphite

Answer

Correct option: B.
$\text{NaCl}$
Isotropic solids have same refractive index in all the directions. As amorphous solids are isotropic in nature.
Hence, amorphous solids like $\text{NaCl}$ will show same refractive index when measured in different directions.

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