What type of wave travels faster through a gas than a solid, can be used to take images of bones, and travels at 300,000,000 m/s through space? a) microwaves b) radio c) ultrasound d) x-ray

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

i would think form in reponse to tensional forces