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How is a flashlight both luminous and nonluminous at the same time?

It's my science homework and I'm not sure how a flashlight can be both luminous and nonluminous.

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At first light it DOES sound a bit confusing.
First, the definition of the term 'NON-LUMINOUS'; 'Not capable of PRODUCING light but can be capable of REFLECTING light from another source'.
For instance, our MOON is NON-LUMINOUS as it REFLECTS light from the Sun. The SUN is LUMINOUS as it produces light that is REFLECTED off the surface of the moon. And so, LUMINOUS means capable of PRODUCING light.
Now closely examine your flashlight.
The BATTERIES produce electrical energy which is transferred to the BULB which emits light, thus LUMINOUS. The tiny little BULB emits quite a lot of light for its small size. However, the bulb is contained within a concave silvered cone which REFLECTS,(NON-LUMINOUS) gathers and channels the emitted light from the BULB (LUMINOUS) into a BEAM which ILLUMINATES whatever you are pointing the flashlight at.
Our cameras would be just paperweights if there were no NON-LUMINOUS surfaces for the light to REFLECT off of, back into the camera lens, onto the 'plate' thus etching the image. For example, take a photograph in the dark without the flash and what do you get. No LUMINOUS, no NON-LUMINOUS.
And so there we have LUMINOUS and NON-LUMINOUS, ILLUMINATING our lives. Enjoy! :)

Posted on Apr 27, 2009

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Luminous means it emits light e.g the sun Non-luminous means that it does not emit light but can reflect light though.     Depending on which part of the flashlight you are referring to around 20% of the flashlight is both and the extra 80% is non-luminous. The bulb is the only luminous part but only when charged with electricity.              i hop this elps 

Posted on Mar 19, 2009

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It's non luminous when it is turned off.

Posted on Jul 21, 2008

  • daniel bay Jul 21, 2008

    and more impotent-- your battery probably gone!

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You can buy flashlights that both luminous and nonluminous?

Posted on Sep 13, 2010

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Well if the light is switch on on the flash light it is luminous and if the light is switch of then it is non-luminous but we can still see the flash light

Posted on Dec 10, 2008

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Hey i have that model cool light
make sure those batteries are charged up
ever thought of led lights?
those are amazing, some of them even glow!
luminiousity

Posted on Jan 26, 2009

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