Final answer:
The ratio of thicknesses of crown glass and water that would contain the same number of wavelengths of light cannot be determined without the indices of refraction.
Step-by-step explanation:
The ratio of thicknesses of crown glass and water that would contain the same number of wavelengths of light can be determined using the formula:
Ratio = λ(glass) / λ(water)
where λ(glass) is the wavelength of light in crown glass and λ(water) is the wavelength of light in water.
The ratio depends on the indices of refraction of crown glass and water, which determine the speed of light in each material. Since those indices of refraction are not given in the question, we cannot determine the ratio with the information provided. Therefore, the answer is d) Insufficient information.