Question

A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then.

• A. The blue piece will look blue and the red piece will look red as usual
• B. The red piece will look brighter red and the blue piece will look ordinary blue
• C. The blue will look brighter as compared to the red piece
• D. Both the pieces will look equal red

Answer 1

Answer: (C)

The blue will look brighter as 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 dimly-lit room, it emits all the radiation of higher wavelength, hence it looked brighter as compared to the red piece.