Chapter 26, Problem 8MCP

Light of wavelength A strikes a pane of glass of thickness T and refractive index n. as shown in Figure 26.40. Part of the beam is reflected off the upper surface of the glass, and part is transmitted and then reflected off the lower surface of the glass. Destructive interference between these two beams will occur if

Figure 26.40

Multiple- Choice Problem 8.

A. $T=\frac{\lambda }{2}$

B. $2T=\frac{\lambda }{2}$

C. $T=\frac{\lambda }{2n}$

D. $2T=\frac{\lambda }{2n}$