Which of the following solids substances will hve same refractive index when measured in diifferent directions?

Which of the following relation is correct for relative refractive index ?

which of the following is true about the value of refractive index of quartz glass ? a) Same in all directions b) Different in all directions c) Can not be measured d) Always zero

Solids for which physical properties like electric resistance or refractive index show different values when measured along different directions are called

The coefficients of thermal expansion of a solid are found to be the same when measured in different directions. Is this an amorphous or crystalline?

For which of the following colour, refractive index is least ?

For which of the following colour , refractive index is least ?