Angle of incidence = Angle of reflection = 40°

Angle between the surface of the mirror and the ray = 90° - 40° = 50°

The contraction or relaxation of the ciliary muscles enables the lens to change its shape to focus on objects at various distances.

Myopia (nearsightedness) is a common condition that's usually diagnosed before age 20. It affects your distance vision — you can see objects that are near, but you have trouble viewing objects that are farther away.

Angle of incidence = Angle of reflection = 40°

Angle between the surface of the mirror and the ray = 90° - 40° = 50°

Angle of incidence (α) equals the angle of reflection (r)

r + 40° = 90° (right angle)

r = 90° - 40°

r = 50°

α = r = 50°

In additive color mixing, red light combined with cyan light, which is composed of green and blue light, will produce white light if combined in the right proportions and intensities.