The wavelength of light in air is\[6000\overset{o}{\mathop{\text{A}}}\,\]and in medium its value is\[4000\overset{o}{\mathop{\text{A}}}\,\]. It means that the refractive index of that medium with respect to air is
A) 1.2
B) 2.4
C) 0.66
D) 1.5
Correct Answer:
D
Solution :
Refractive index of medium \[n=\frac{{{\lambda }_{a}}}{{{\lambda }_{m}}}\] \[=\frac{6000}{4000}=1.5\]