Final answer:
The thickness of the aluminum foil is 17.0656 μm.
Step-by-step explanation:
The thickness of the aluminum foil can be calculated using the formula:
Thickness (in μm) = Number of fringes × Wavelength of light (in μm)
Given that the number of fringes is 27 and the wavelength of light is 632.8 nm = 0.6328 μm, we can substitute these values in the formula to calculate the thickness:
Thickness = 27 × 0.6328 μm = 17.0656 μm
Therefore, the thickness of the aluminum foil is 17.0656 μm.