Light travels in a straight line and the phenomena is known as rectilinear propogation of light. There are many natural phenomena that occur due to this property of light, such as occurence of day and night.1) find out such applications natural as well as those commonly seen .2.) information about their way of occurance.3.) know the various usage of this property of light.
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* Shadow Formation.
* Interference of light.
* Scattering of light.
* Twinkling of stars. etc
2) information about their way of occurrence:
* Shadow Formation. : It occurs due to particle nature of the light that is why we are able to see the shadow where the light particles are not able to reach as they are blocked by opaque object.
* Interference of light. : It occurs due to wave nature of particle.
* Rainbow : It occurs due to total internal reflection followed by refraction.
* Mirage : It occurs due to multiple atmospheric refraction.
* Twinkling of stars : It occurs due to multiple atmospheric refraction etc
3) various usage of this property of light.
*Image formation in human eyes etc