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. The intensity of the light can be obtained using the relation I 1 2 c 0 E 2 I 1 2 c 0 E 2 from Electromagnetic Waves. 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. The purple line with peaks of the same height are from the interference. It is a product of the interference pattern of waves from separate slits and the diffraction of waves from within one slit. Distance is measured to the first luminating surface - the filament of a clear bulb, or the glass envelope of a frosted bulb. The solid line with multiple peaks of various heights is the intensity observed on the screen. 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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