PHY113-2 (Reflection)

A hemispherical view of a sound wave emitted by a pulsating sphere. The rays are perpendicular to the wave fronts.

• True

• False

The incident ray, the reflected ray, and the normal to the surface all lie in the same plane, and the angle of incidence equals the angle of reflection.

• True

• False

In diffuse reflection, the reflected rays are parallel to each other.

• False

• True

Answer explanation

In specular reflection, the reflected rays are parallel to each other.

A ray of light from the top of the chess piece reflects from the mirror. To the eye, the ray seems to come from behind the mirror.

Because none of the rays actually emanate from the image, it is called a

• real image
• reflected image
• distorted image
• virtual image

If the inside surface of the spherical mirror is polished, it is a -. If the outside surface is polished, is it a -.

• concave mirror; convex mirror

• convex mirror; concave mirror

The - of the mirror is a straight line drawn through the center and the midpoint of the mirror.

• center point
• mirror plane
• principal axis

• line of reflection

• A point on the tree lies on the principal axis of the concave mirror.

  Rays from that point that are near the principal axis cross the axis

  at the image point.

• A point on the tree lies on the principal axis of the concave mirror.

  Rays from that point that are farther the principal axis cross the axis

  at the image point.

• A point on the tree lies on the principal axis of the convex mirror.

  Rays from that point that are near the principal axis cross the axis

  at the image point.

• Light rays near and parallel to the principal axis are reflected from the concave mirror and converge at the focal point.

• Light rays near and parallel to the principal axis are reflected from the concave mirror and diverge at the focal point.

is the distance between the focal point and the mirror.

• mirror length
• image distance
• focus point distance
• focal length

The focal point of a concave mirror is halfway between the center of curvature of the mirror C and the mirror at B. What is the equation for this?