ELCA Physics - Light and Shadow

When looking at a shadow, the _______ is the part of the shadow that receives no light.

• crux

• umbra

• totality

• eclipse

True or False: When looking at a mirror, the image that a person sees appears to be behind the mirror. This image is called a virtual image.

• True

• False

A ray of light that strikes the mirror at a certain angle. This angle is called the "angle of ____".

• accountability

• divergence

• incidence

• acuteness

The part of a shadow around the edges that is fuzzy, and not very sharp is called the ______.

• penumbra

• fuzzy logic

• Van Allen Belt

• stigmatism

A shadow has two parts: the _____ and the _____.

• hook; ladder

• umbrella; penultimate

• cream; clear

• umbra; penumbra

• obtuse

• acute

The Law of Reflection states that the angle of incidence is ____ the angle of reflection.

• equal to

• greater than

• less than

• parallel

True/False: If a vampire looks into a mirror and sees only his fangs, he will see only his fangs even if he backs away from the mirror by 5 feet.

• True

• False

True/False: A light wave requires a medium through which to travel

• True

• False

True/False: A light wave is a longitudinal (or compression) wave.

• True

• False