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when light is reflected by a mirror, the angle of incidence is always
a. less than the angle of reflection.
b. greater than the angle of reflection.
c. equal to the angle of reflection.
d. 90 degrees with respect to the reflecting surface.

Equal to the angle of reflection.

Explanation:

There are two laws given for the reflection through mirrors. According to the law of reflection :

1. The angle of incidence, the angle of reflection, the incident ray, the reflected ray and the point of incidence all lie in the same plane.

2. The angle of incidence is equal to the angle of reflection.

So, when light is reflected by a mirror, the angle of incidence is always equal to the angle of reflection. Hence, the correct option is (c).

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.