Answer fast.

1) ((false))because luminous means producing own light .. and stone does not produce its own light..

2)((true)) because it gives out or emit light of their own.

3)((false)) The size of the shadow formed depends on the angle of incidence of the light beam falling on it.

4)((true)) because muscular energy is acting on the object.

c. taught scientists many new things about the earth, but not other planets.

explanation:

sounds good to me mate!