![]() Next in Step 2, enter the original measurement value taken at the original distance into the e1 box.įinally in Step 3, enter the new measurement distance in the d2 box.Īfter that, click the Calculate button to calculate what the new measurement value (Output) will be at the new distance based on the Inverse Square Law.Ĭlick the Reset button to reset the calculator. In Step 1, enter the original measurement distance in the d1 box. Data may be entered into the calculator either in decimal format (i.e. The calculator itself does not need to work with optical or distance units but those units are assumed and in the case of the distance units, must be consistent from the original distance to the new measurement distance. Please note: This calculator should only be used if the light source approximates a point source and the original measurement to calculate from is in irradiance or illuminance units (i.e. What will the flux density be at half the distance? Get access to our light intensity calculator by downloading it on our website today.Įxample: You measure 10.0 lm/m² from a light bulb at 1.0 meter. With the symbol v v for lumen, I v I v for candela and for the angular span in steradian, the relation is: v I v v I v. The variations in photoelectric current which is produced as a result of photoelectric effect are caused by the. The lumen (unit lm) gives the total luminous flux of a light source by multiplying the intensity (in candela) by the angular span over which the light is emitted. There are some factors which impact the process of photoelectric effect including frequency, energy and intensity of light. We know that the intensity is given by the ratio of. The phenomenon of photoelectric effect was discovered by a German physicist Heinrich Rudolf Hertz in 1887. ![]() Distance is measured to the first luminating surface - the filament of a clear bulb, or the glass envelope of a frosted bulb. We have to use the concept and equation of the electromagnetic wave to find the solution of this problem. It states that the intensity per unit area varies in inverse proportion to the square of the distance. ![]() The inverse square law of light defines the relationship between the irradiance from a point source and distance. Download Calculator Light Intensity Calculator ![]()
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