Speed of light in Cubic zirconia, v = 1.36 x 10⁸ m/s
Speed of light in sodium chloride v =1.94 x 10⁸ m/s
Speed of light in polystyrene v =1..89 x 10⁸ m/s,explained clearly in below attached picture.
Zirconium dioxide exists in the cubic crystalline form known as cubic zirconia (CZ) (ZrO2). The synthetic material may be produced in a wide range of hues, although it is typically hard and colorless. Zircon, a zirconium silicate, should not be confused with it (ZrSiO4). It is occasionally mistakenly referred to as cubic zirconium.
Sodium chloride, generally known as salt, is an ionic substance with the chemical formula NaCl, denoting a 1:1 ratio of sodium and chloride ions. Sea salt, however, also contains other chemical salts. The molar weights of 39.34 g Na and 60.66 g Cl in 100 g of NaCl are 22.99 and 35.45 g/mol, respectively.
A synthetic polymer known as polystyrene is created from the monomers of the aromatic hydrocarbon styrene. Solid or foamed polystyrene are both possible. Polystyrene for general use is transparent, rigid, and brittle. Per unit weight, it is a reasonably priced resin. It has a relatively low melting point and a weak barrier to oxygen and water vapor.
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