Harry is reading an online summary of the law of reflection. the site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror.
which statement corrects an error on the site?
the normal is a line perpendicular to the surface of the mirror.
the normal is a line perpendicular to the incoming ray.
the angle of reflection is the angle between the incoming ray and the normal.
the angle of reflection is the angle between the reflected ray and the incoming ray.

The normal is a line perpendicular to the surface of the mirror.

Explanation:

By definition, the normal to a surface corresponds to a line perpendicular to the surface. Therefore, the normal of a mirror is perpendicular to the surface of the mirror. So, the statement

"the normal, which is the surface of the mirror."

is wrong.

The law of reflection states that the angle of incidence on the surface of a mirror is equal to the angle of reflection, where the two angles are defined as:

- Angle of incidence: the angle between the incoming ray and the normal to the mirror

- Angle of reflection: the angle between the reflected ray and the normal to the mirror

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

no. dot product   =0 when vecs at right angles