Which of the following always occurs when a light ray reflects off a mirror? a. the speed of the light ray increases b. the direction of the light ray stays the same c. the frequency of the light ray decreases as it reflects and loses energy to the mirror d. the angle at which the light ray strikes the mirror equals the angle at which it reflects

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?