Which of the following are opaque object ?

Which of the following is a parallel beam of light ?

Objects which does not allow light to pass through them are called ________________ .
 

To see various objects we need _____________________.

Light travel in _______________________ .

A medium in which light cannot travel is called _________________________ .

Which of the following are correct :

(a) When the group of rays are parallel to each other such beam of light is called a parallel beam of light.

(b) When the group of rays are not parallel to each other but are converging at a point such beam of light is called a convergent beam of light.

Which of the following are correct :

(a) Objects that give out light are called luminous objects.

(b) Objects that do not give out light are called non luminous objects.

Which of the following are correct :

(a) A narrow path of light represented by a line with an arrow head showing the direction in which it is traveling called a ray of light. 

(b) A group of light rays is called a beam of light.

(c) When the group of rays are parallel to each other such beam of light is called a parallel beam of light.

Which of the following are correct :

(a) Shadow is the dark region formed behind an opaque object.

(b) The shadow consists of a dark patch surrounded by a partially dark patch.

(c) The partially dark patch is called penumbra.