In thin film of wedge shaped, by keeping all other parameters constant

increases, due to the income effect but decreases due to the substitution effect.

increases, due to the substitution effect but decreases due to the income effect.

increases from A to B due to the income effect, and then to C due to the substitution effect.

decreases.

In thin film of wedge shaped, by keeping all other parameters constant, if only wavelength of incident light is increased. What will be the effect on bandwidth? 选项： A:Bands will merge B:There will not any effect C:Bandwidth increases D:Bandwidth decreases