___________ is the primary source of light.

______________ happens on a full moon day.

Objects that cast shadow are _________ objects.

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

_________ is a narrow path along which the light travels.

When opaque objects are placed infront of sunlight or torch light ________ is formed behind the object.

Bodies that emit light on their own are called

_____________ occurs when earth comes in between sun and moon.

The emission of light given out by an organism is called

When moon comes in between the earth and sun and cast its shadow on earth, it is called