Question

Glass allows light to pass through it because it is -

• A. opaque
• B. non-luminous
• C. luminous
• D. transparent

Answer 1

Answer: (D)

Objects which allow the light to pass through them completely without any obstruction are called $transparent$ objects.

Objects which do not allow the light to pass through them are called $opaque$ objects.

Objects that give out or emit light of their own are called $luminous$ objects.
Objects which do not emit light on their own are called $non-luminous$ objects.

Thus, glass allows light to pass through it because it is transparent.