Question

A piece of blue glass heated to a high temperature and piece of red glass at room temperature, are taken inside a dimly lit room, then

• A. The blue glass will look blue and red will look as usual
• B. Red looks brighter red and blue looks ordinary blue
• C. Blue shines like brighter red compared to the red piece
• D. Both the pieces will look equally red

Answer 1

Answer: (C)

Blue shines like brighter red compared to the red piece

When blue glass is heated at high temperature, it absorbs all the radiation of, higher wavelength except blue. If it is taken inside a dark room, it emits all the radiation of higher wavelength, hence it looks brighter red as compared to the red piece.