Examples of reflection. Plane wave, plane surface. The phase of the reflected sound waves from hard surfaces and the reflection of string waves from their ends determines whether the interference of the reflected and incident waves will be constructive or destructive.
The tendency to develop allergies is often hereditary, which means it can be passed down through genes from parents to their kids. But just because you, your partner, or one of your children might have allergies doesn't mean that all of your kids will definitely get them, too.
While some people are truly more sensitive to sunlight than others and may have a hereditary type of sun allergy, many people use the term sun allergy when, in fact, their reaction to sunlight is caused by use âof various medications or topical agents that cause a reaction on the skin when exposed to sun.