Optics Part- I
Optics is the branch of Physics deals with light and the way it affects and is affected by other things
Al-Hasan Ibn Al-Haytham is called the father of Optics .He is describer of
vision theory.
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| Al-Hasan Ibn Al-Haytham |
Let’s us know some properties of Light:
1) Rectilinear propagation of light - Light travels in straight line
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| pinhole camera based on this principle. |
2) Speed of light – The rate at which light travels is known as speed if light . It has maximum speed in vacuum/air. When it goes to optically denser medium speed of light decreases.
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| Speed of light and it's medium |
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| Reflection of light |
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| Reflection by curved mirror |
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| Refraction of light |
5. 5) Total internal Reflection- When light travels from denser
medium to rarer medium beyond certain angle of incidence in place
of refraction reflection takes place. This
property of light is called Total internal reflection.
Mirage (false impression of pool of water in desert in
hot day) falls under this.
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| Mirage |
6.
6) Dispersion of
light- the property of light where the white light splits
into its constitutes
seven colours is called Dispersion of light
Dispersion can be
observed by prism. Rainbow natural phenomenon is the best example of
dispersion of light
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| Dispersion of light |
7. 7) Scattering of light – Light rays get deviated from its straight
path on striking dust or gas molecules, water vapour etc.
Some effects are –
●Sun appears red in the morning and in the but white at noon.
● Red colour used as danger signal.
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| Red colour used as danger signal |
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| Abhilasha Jha, Jamshedpur |
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| Abhilasha Jha, Jamshedpur |
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| Arpita Mishrsa, Jamshedpur |
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| Abhilasha Jha, Jamshedpur |
RITU
