how does the sensitive light works?
823896
did you mean how does a light sensor work?
165109
You are seeing the effect of pressure on the rods of your eye, which are fooled into thinking they see light. It should appear on the opposite side from which you press. It's called "phosphene".
870781
a light bult emits the same amout of light in a dark room as it does in a bright room.  Your eyes, when adjusted to dark, allow more light in and it seems brighter.
924231
use a photo transistor that is triggered by the light emitted from the LED to click some relays or something.
688698
On one can tell lighting is different every time.\nJust like it does not hit the same place two times in a row.
537588
1) The original or main light source.Can be increased or decreased.\n\n2) Diaphragm - It can control the diameter of the aperture and thus control the light intensity.\n\n3) Filter- by using suitable colour of the filter one can control the light intensity.
832832
Techno Alan is wrong. The glass does absolutely nothing to shift the infrared to the visible spectrum.  What is does is absorb some of the visible light while allowing the near infrared to pass through.  Photographic film can be made to respond to the near infrared, meaning that just as some of the layers in the film get exposed by the red , green or blue, an IR film has a layer that is also sensitive to the near IR.  So all that the filter does is to supress the visible part of the scene relative to the near IR.\n\nMost digital cameras include a infrared and UV filter over the sensor.  The filter prevents near infared light from adding noise to the red pixels in the camera array, and at the same time prevents you from taking the IR picture.  The UV filtering prevents the "fogging" that can occur on bright days from UV background. It eliminates the need for the "skylight filter" that is frequently used in film photography to enhance contrast.\n\nNow to the original question - to see in the infrared you need to use a sensor that can detect infared light and then convert it to a visual image.  Night vision goggles use a layer of material that emits an electron when it absorbs a near infrared photon.  The eletrons are "multiplied" uisng a "microchannel plate".  The stream of electrons then strikes a phosphor screen, making a visible image.  \n\nAt longer infared wavelengths different detector materials are used.  The materials can be either photoconductive (absorbed light changes the conductivity of the material which can be electrically read out) of photovoltaic (absorbed light generates electric charges - electrons and hoels-  within the semiconductor marterial that are collected and read out).  (CCDs or CMOS sensors in digital cameras are photovoltaic imaging devices that are sensitive to visible light).  There are also "bolometer" thermal sensors that absorb infared light, generatyinga  small change temperature can be read out to form an image.
1124988
There is a small switch on the side of the fridge that turns the light inside off when the door closes.  It usually looks like a button.
748812
In addition to the other answers - you can set it on its base and have it illuminate whatever you are doing without anybody having to hold it.
837291
You are in a 10-foot room with a light in the center.  The photons leave the light, zoom to the wall in 5 nanoseconds, reflect off the wall, and (some of them) zoom into your eye 5 nanoseconds later,  where your brain perceives them about 300 millisconds later.\n\nYou turn off the light.  Generally, the light will cool and stop emitting photons within, say, 100 milliseconds.  But suppose it is a specially-constructed light, and it turns off in 10 picoseconds.  The last photons stream to the wall in 5 nanoseconds, reflect, and hit your eyes 5 nanoseconds later.   Some of the photons that miss your eye may reflect off the walls several times, but there is a 20 to 80% chance of their being absorbed by the paint on the wall each time they reflect.  The brightness in the room therefore decreases a factor of about 2 every 10 nanoseconds.  Within 100 nanoseconds, the number of photons in the room has decreased a factor of about 1000, and it becomes dark.
157911
use a blacK light and see what happens
538368
light sensitivity is associated with migraines, and who knows it could have some connection. Maybe you are starting to develop migraines. You're gonna have to tell a doctor abou this. While 20% of us have this condition, only about 1% actually know it.
998464
moving from a higher to a lower energy level releases energy, producing light, but;\nit only produces light in the visible light spectrum when it moves down to level n=2.  if it ends up at another energy level, the light released will be infared, ultraviolet, etc... depending on where it ends up.
167146
turns light into energy.\n\ncharge a battery for free
626755
passive infrared detectors, solid-state cont actors, ultrasonic devices, and photosensitive controls at their disposal\n\n\n\nManual or automatic dimming equipment, which can respond to many inputs, allows the illumination of a space to be set at any desired level. The semiconductor used in a dimmer circuit is called a triac. The triac provides phase control, meaning that it regulates the current to the lighting load by only conducing during a selected part of the AC power cycle.\n\nIncandescent dimming devices include wall box-type units rated as high as 2,000W that can fit in a single-gang electrical device box. Some models allow dimming from two or more locations, which previously required a remotely controlled dimmer module.\n\n\n\nfor any further clarification, you can mail me
416072
It depends on the wavelength of the light and its energy.
433199
Just look inside a flashlight.  Simple circuit with a switch.  Open the switch, no light.  Close the switch (turn on light), you have current flowin'.