The testing step in the design process of a new product makes sure that everyone can use the product.

Which best represents the law of conservation of mass ?

Why don't you see your reflection in water with waves or repples

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance