Unit - 5.1 Light And General Terms Used In Understanding Light PHYSICS - Unit - 5.1 Light And General Terms Used In Understanding Light

Which is not a transparent medium?

Which is not a translucent body?

Which is an opaque body?

Which is a luminous body?

Which is not a luminous body?

define the following : A divergent beam of light.

define the following : A convergent beam of light

define the following : A parallel beam of light

define the following : A ray of light

By giving three examples, define non-luminous bodies.

What kin of beam of light is formed by : A flash light of a torch

What kin of beam of light is formed by : Search light or spot light

What are opaque bodies? Why are opaque bodies not called opaque medium? Give four examples of the opaque bodies.

Why are moon and planets considered as non-luminous bodies?

Classify the following as (a) transparent medium, (b) translucent medium, (c) opaque bodies. (i) an iron box (ii) a window pane (iii) a ground glass window (iv) wool (v) vacuum (vi) an iron nail (vii) muddy water (viii) butter paper (ix) diamond (x) marble

What do you understand by the term optical medium? What are its kinds? Give two examples of each kind.

Define light energy and then explain it clearly.

( pinhead,medium)
A source of light which is of the size of__ is called a point source of light.

(medium,high)
Anything which allows the light energy to pass through it called a __.

(non-luminous,luminous)
The moon and the planets are __ bodies.

(heating, lightning)
A non-luminous body can be made luminous by ___ it.

( light , heat )
An invisible energy which causes in us sensation of sight is called__energy.

Vacuum is an opaque medium.

Deep sea water is a transparent medium.

Sunlight entering in a room through a door is an example of divergent beam.

Light itself is invisible, but causes the sensation of vision.

Shooting stars are luminous bodies.