Velocity of light in a liquid is `1.5 xx 10^8 ms^(-1)` and in air,it is `3xx10^8 m s^(-1)`.If a ray of light passes from this liquid to air ,calculate the value of critical angle.

Options

A. less then `sin^(-1) (2//3)`
B. equal to `sin^(-1) (2//3)`
C. equal to or less than `sin^(-1)(3//5)`
D. equal to or greater than `sin^(-1)(3//4)`.