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Subject: Science , asked on 14/9/09

# State the Principle of reversibility of light

The principle that if a beam of light is reflected back on itself, it will traverse the same path or paths as it did before reversal.

The principle of reversibility states that light will follow exactly the same path if its direction of travel is reversed.

Hence:

Using Snell's Law,

 sin i sin r = 1 n 2 sin r sin i = 2 n 1
 1 n 2= 1 2 n 1

It follows that

 1 n 2= 1 2 n 1

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Sorry  ,

Using Snell's Law,

 sin i sin r = 1 n 2 sin r sin i = 2 n 1
 1 n 2= 1 2 n 1

It follows that

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when light strikes any reflecting surface, then it goes in the same medium . if mirror is placed at right angle to the reflected ray then it returns in the same path from where it incident without any deviation

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http:// www. meritnation. com/ ask - answer / question / plzz - explain - principle - of - reversibility - of - light/ ray -optics - and - optical - instruments / 1680674

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The principle that if a beam of light is reflected back on itself, it will transverse the same path or paths as it did before reversal.
The principal of reversibility states that light will follow exactly the same path if its direction of travel is reversed.
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Refractive index for light going from medium 1 to medium 2 is equal to the reciprocal of refractive index for light going from medium 2 to medium 1
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thanx

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http:// www. meritnation. com/ ask - answer / question / plzz - explain - principle - of - reversibility - of - light/ ray -optics - and - optical - instruments / 1680674

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we can prove this by a expiriment using a glass salb

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 1 n 2= 1 2 n 1

this is the final equation.Sorry again

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snells law also stated that this world is filled with idiots
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show that incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab

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http:// www. meritnation. com/ ask - answer / question / plzz - explain - principle - of - reversibility - of - light/ ray -optics - and - optical - instruments / 1680674

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when light strikes any reflecting surface, then it goes in the same medium . if mirror is placed at right angle to the reflected ray then it returns in the same path from where it incident without any deviation

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how

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When light pass rarer to denser medium it refract towards normal and when light pass denser to rarer medium it refract away from the normal
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if the mirror placed in front of the light is spherical?
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http:// www. meritnation. com/ ask - answer / question / plzz - explain - principle - of - reversibility - of - light/ ray -optics - and - optical - instruments / 1680674

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http:// www. meritnation. com/ ask - answer / question / plzz - explain - principle - of - reversibility - of - light/ ray -optics - and - optical - instruments / 1680674

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The answer is : We know that "ANGLE i = ANGLE e"  & "ANGLE R1 = ANGLE R2". As External & internal Angles r equal. The lines are Parallel

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since the opposite faces or refracting surfaces are parallel incident ray and emergent ray are ll

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