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19. A thin film of soup voluton = 14) les onthe top of a glass plate=5 When visiblelught is incident almost normal to the plate, twoadjacent reflection maxima se observed at twowavelengths 400 and 630 mm The munimumthickness of the soap soluton is1) 420 nm2) 450 mm3) 630 nm4 1260 nm |
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