______________ is an important feature of light that it always travels in a straight line when it travels in the same medium

Human body is

___________ is the primary source of light.

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

_____________ occurs when earth comes in between sun and moon.

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

______________ happens on a full moon day.

Burning candle, oil lamp, tube light are _____________

_________ is a narrow path along which the light travels.