_____________ occurs when earth comes in between sun and moon.

Objects that cast shadow are _________ objects.

___________ is the primary source of light.

Bodies that emit light on their own are called

The emission of light given out by an organism is called

Substances which allow only partial transmission of light to pass through them are called

______________ is a simple device which is used to take photographs of stationary objects

Burning candle, oil lamp, tube light are _____________

_________ invented Telescope.

The substances which do not allow the light to pass through them are called