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burning a candle infront of a mirror?

burning a candle infront of a mirror? - Physics Forum

burning a candle infront of a mirror? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 05-06-2004, 01:29 PM
yogesh
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Default burning a candle infront of a mirror?



I am burning a candle infront of a mirror in a room.
Will the mirror image acts as a separate light source?

What will be the difference between buring a candle in front of a
mirror in a closed room and burning two candles(without mirror in the
room)?

In short the question can be reframed as " Do the mirror images of
light source act as a separate light source?"

regards,
Yogesh
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  #2  
Old 05-06-2004, 01:35 PM
tony
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Default burning a candle infront of a mirror?

>
I'll assume for the moment it's a serious question.
There's only one souce of light in the room. All the mirror does is reflect
back that portion of the light that would otherwise have been absorbed by a
wall or some such thing.


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Old 05-06-2004, 03:47 PM
Greg Neill
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Default burning a candle infront of a mirror?

"yogesh" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ] m...

It'll be dark behind the mirror.


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  #4  
Old 05-07-2004, 12:10 AM
|-|erc
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Default burning a candle infront of a mirror?


"yogesh" <[Only registered users see links. ]> wrote in ...

Yes. That's why torches have reflectors. Expect about 30% brighter room
with a nearby mirror (any better approximations?).

1 Less than half the light from the candle reaches the mirror (from 1 side).
2 The mirror is only about 90% efficient.
3 A white wall is nearly as effective, so the mirror will give a lot more light
than a black wall.

There is a fixed amount of light output from the candle though, be an intereresting
geometry problem to see if many mirrors approaches this value, the
location for the measurement of brightness has to be considered.

Herc



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