Non-luminous bodies reflect all the light that falls on them.

Transparent objects allow all the light that falls on them to pass through them.

Light may take several years to travel from the star to us.

A solar eclipse can be seen directly without any protection.

A shadow of an object is always of the same size as the object.

The image formed by a plane mirror is always of the same size as the object.

The image formed by a pinhole camera is always of the same size as the object.

How do you see non-luminous objects?