light

Light

by Humaid Khan

​Learning Objective: Students will be able to understand and explain......

​

Sources  of light

​Propagation of light

​Shadow

​

​Light is something that enables us to see. The things around us. We cannot see anything if there

​is not light.  Objects that give out light are called luminous objects. Objects that do not give out light are called non-luminous objects

​Fire fly

Any objects that gives out light is called sources of light.

Luminous objects are also called sources of light.

​Sources of light can be natural or artificial. {man-made}

​Examples of natural sources of light are the sun and others stars

​and insects like firefly.

​Metal, Mud and cement

​are examples of opaque.

​A mirror is a very good

​example of an opaque

​object.

Transparent Object​

​

​Matireals that allow light to pass through significant scattering or

​absorptation are called transparent materials. We are able to see throughthese materials very cleerly.

​

 Eg: clear air, clear glass, cleen water, some kinds of plastic and cellophane paper.

​Propagation Of Light

​Usully light travels in a stright line.

​When we want to repreasent the propagtion of light with a diagram,

​we repreasent it with the help of rays and beams.

Multiple Choice

Which light source causes shadows in the outdoor environment ?

• SUN

• LIGHT BULB

• TORCHE

Multiple Choice

When an object blocks the path of light, what is formed ?

• A problem

• A reflection

• A shadow

Multiple Choice

What does reflection mean?

• bending light

• bouncing light

Multiple Choice

Light ________ our eyes.

• enters

• is produced in

• shoots out from

Open Ended

In the first image we can see that the girl can see through the pipe whereas in the second case it is blocked. Justify?

Multiple Choice

What is the earth's primary source of light energy?

• moon

• sun

• fire

Multiple Choice

Which of these is our MAIN (most important) source of light?

• Lightbulbs

• The sun

• Fire 

• All of the above

Multiple Choice

A shiny piece of metal will __________ light.

• reflect 

• refract

Multiple Choice

Light travels slower through water than it does through air, this cause the light to be ___________.

• reflected

• refracted

Multiple Choice

Opaque means...

• No light passes through it

• All light passes through it

• Some light passes through it

Open Ended

can light pass through mudded water?

Justify.

Multiple Choice

What does refraction mean?

• bending light

• bouncing light

Multiple Choice

_______ is when light hits and object and it BOUNCES off.

• Reflection

• Refraction

Multiple Choice

Light can pass through all objects.

• TRUE

• FALSE

Multiple Choice

Which of these objects use REFRACTION?

• Telescope

• Microscope

• Magnifying glass

• ALL of them

Multiple Choice

Refraction makes objects look different.

• TRUE

• FALSE

Multiple Choice

Things make shadows because they ______ light.

• BLOCK

• PASS

Fill in the Blanks

Type the names of all luminous objects {only luminous objects}

​THANK YOU

​Thank you all for participating in this lesson.