Answer:
★The second law of refraction
The ratio of sine of angle of incidence to the sine of angle of refraction is a constant for a light of given colour and for a given pair of media. This law is also called Snell's law of refraction. If 'i' is the angle of incidence and 'r' is the angle of refraction then, Sin i/Sin r = constant
This constant value is called the refractive index of the second medium with respect to the first.
Thermal energy (any word that begins with therm has to do with heat)
The statement that is true about Planck's Law is that the frequency of the emitted light is directly proportional to the energy given off by the electrons. The correct answer is B.
