Those having smooth and polished surfaces; such as tin, silver, gold, and quicksilver.
What objects are poor reflectors of light?
Those having dull, uneven surfaces; such as iron, wood, cloth, leather, and calico.
Of what is every ray of sunlight composed?
It is composed of the seven colors of the rainbow.
What does a looking-glass do with these colors?
A looking-glass throws them all back from its surface.
What does a glass window do with these colors?
A glass window permits all these colors to pass through it.
What do opaque substances do with these colors?