The study of geometrical optics involves: a) practical applications to optical instruments b) describing the paths taken as light passes through different media c) regarding light as traveling in straight lines - light rays d) all the answers are correct

When a light ray is incident on an interface between two different media: a) it is always only reflected b) it may be both reflected and refracted c) it is always only refracted

d) none of the answers is correct.

According to the Law of Reflection:

a) the angle of refraction is equal to the angle of incidence

b) the angle of reflection is equal to the critical angle c) the angle of reflection is equal to the angle of refraction

d)the angle of reflection is equal to the angle of incidence