A thin film of \( \mathrm{MgF}_{2}(n=1.38) \) coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 410 nm and 513 nm . Part A What is the thinnest film for which this can occur? Express your answer with the appropriate units. \[ d= \] Previous Answers \( \mathbf{X} \) Incorrect; Try Again; 5 attempts remaining