Muscovite (n=1.56), or better known as mica, is a phyllosilicate mineral of aluminum and potassium. new industrial uses include being an insulator, usually for small electrical componenets. fabrication of divices with mica ofter require high precision on the determination of the mica thickness. if a mica sheet is suspended in air and reflected light shows gaps in the visible spectrum at 450, 525, and 630 nm, what is the thickness of the mica sheet?