A transparent film (n = 1.43) is deposited on a glass plate (n = 1.52) to form

Question:

A transparent film (n = 1.43) is deposited on a glass plate (n = 1.52) to form a nonreflecting coating. The film has a thickness that is 1.07 × 10-7 m. What is the longest possible wavelength (in vacuum) of light for which this film has been designed?