2 x 10-8m
2 x 10-9m
2 x 10-7m
3 x 10-9m
2.8 x 10-8m
Correct answer is B
Mass of one oil = \(\frac{5 \times 10^{-4}}{1000}\)
= 5 x 10-4kg
Density = \(\frac{\text {mass}}{\text{area x thickness}}\)
500 = \(\frac{5 \times 10^{-7}}{\text{0.5 x thickness}}\)
thickness = 2 x 10-9m