Author's Correction: “Student Difficulties in Analyzing Thin-Film Interference,” Phys. Teach. 47, 227–230 (April 2009) Available to Purchase

I am slightly embarrassed to have found two small errors in my April paper, owing to imperfect proof reading on my part. They do not affect the content in any way. They are in two equations in the last paragraph before the “Conclusion” section: In line 7, $2m + 1/2$ should be $(2m + 1)/2$ or $m + i/2$⁠.