10 to the power minus 5 multiply with 9 to the power minus 4 divide by 2 to the power minus 4 multiply with (15) to the power minus 3
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d= volume of the oil drop/ area of the film
= 4/3 *pi* (0.025cm)^3/(pi* (10 cm)^2
= 2.08X10^-7 cm
= 4/3 *pi* (0.025cm)^3/(pi* (10 cm)^2
= 2.08X10^-7 cm
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