if the angle of incidence increases and the indexes of refraction stay the same what happens to the angle of refraction

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity