Question

When a yellow piece of glass is heated in a dark room, then it emits light of
A. yellow color
B. red color
C. blue color
D. green color

Answer 1

We should understand the complementary colors are those two colors which produce white light.

Complete step by step answer:
When we see the complimentary color, when a yellow piece of glass is heated in a dark room it will emit light of blue color.
Primary colors are those which do not get dispersed when passed through a prism. The primary colors are red, blue and green. Complementary colors are those two colors which produce white light.
Hence the correct option is C.

Note: Complementary colors:
Yellow + blue = white
Red + yellow + blue = black
When a green body is heated in a dark room then it appears red because it emits all colors except green and the emitted colors are dominated by red color. It is also true vice-versa.