Can viruses, bacteria, and fungi be considered parasites?

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Which describes increasing the efficiency of energy resource

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion