Three Experiments Involving a Thin Film (In Air) Are Shown $\lambda$

question 30

Multiple Choice

Three experiments involving a thin film (in air) are shown. If t denotes the film thickness and $\lambda$ denotes the wavelength of the light in the film, which experiments will produce constructive interference as seen by the observer?

• A) I only
• B) II only
• C) III only
• D) I and III only
• E) II and III only

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