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The interference pattern consists of equally spaced fringes. (c) If t ≈ 0, very thin film, x ≈ 0, film appears dark in reflected light. A plot of light intensity versus d sin is given in Figure 37.7. And A is the surface area covered by the light source. MF is the light source’s maintenance factor. UF (sometimes denoted as Cu) is the coefficient of utilization. F (sometimes denoted as LI) is the average lumens value of the light source. Resultant Amplitude A = (a 2 + b 2 + 2ab cos Φ) 1/2 You can also use the E F x UF x MF / A formula where: E (sometimes denoted as I) is the illuminance. If the intensity was measured one meter away from. Calculating PAR from Energy units Source of Light, Conversion Factor Sunlight, 1 joule 4.6 mol/ m2/s HPS lamps, 1 joule 4.95 mol/ m2/s Red LED, 1. We will just accept this energy density as given. These results are a little bit tricky to derive from what we already know, so we do not attempt a derivation here.
#Light intensity formula free
By superposition of waves of same frequency and constant phase difference (coherent waves) redistribution of energy takes place so intensity is maximum at certain points and minimum at others. This works because the Power output of the light source has to be divided by the surface area it has to cover. (1) u E 1 2 0 E 2 c 2 (2) u B 1 2 0 B 2 where 0 is the magnetic permeability of free space, 4 × 10 7 N/A 2.
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