Short/Long questions answer
What do we call a body that shines on its own ?
What do we call an electric bulb producing light ?
What is a transparent medium ? Give two examples.
Explain the difference between a transparent, a
translucent and an opaque medium. Give two
examples of each.
What do we call a substance through which we
cannot see light ? Give an example of such a
substance.
What do we call a substance through which light
passes ? Give an example of such a substance.
Can a transparent medium form an image? Explain
your answer.
- How can you obtain a point source of light ?
Define the terms: a ray of light and a beam of light.
. What do you mean by ‘rectilinear propagation of
light'?
. Describe an experiment to show that light travels
in a straight line path.
Answers
HERE U GO .......
1) A BODY OR OBJECT THAT HAS ITS OWN LIGHT AND SHINES IS CALLED A LUMINOUS OBJECT.
2)WE CAN CALL IT ' incandescent light bulb '.
3) Transparent medium can be said as the medium will allows the light to pass through it is called as the transparent medium.
4)Transparent : medium that allows light to pass through it easily. Ex-windows, clear glass.
Translucent : medium that allows little amount of light to pass . ex- sunglasses, water
opaque : medium that does not allows any light to pass through it.Ex- book, table
5)Transparent substance . ex- glass
6)No, a transparent medium cannot form image. All the light that passes through a transparent medium completely pass through the substance. For the formation of image it is must that the light rays get reflected through the surface.
7)A point source of light is obtained either by placing a screen having a fine hole, in front of die luminous body or by placing the luminous body inside a box having a fine hole on one of its side.
8)The direction or path along which light energy travels in a medium is called a ray of light.
A group of light rays is called a beam of light.
9)The Rectilinear Propagation of Light describes that Light travels in a Straight Line..
10) an experiment or an activity.
A girl arranges three pieces of card, with holes in, in an uneven line. The light stops and cannot travel through all three cards. When she arranges the holes in a straight line, the light can travel through.
this shows light travel in straight lines.
hope it is helpful.....☺☺☺