Use computational tools to check your math. For example, Hecht’s diffraction integrals can be verified with Wolfram’s definite integral calculator.
A complete solution manual for the 5th edition generally mirrors the book’s 15 chapters: optics hecht 5th edition solution manual
For each of these, the manual provides worked solutions to problems labeled with numbers like "5.23" or "9.47." Use computational tools to check your math
There is a legitimate student solution manual for the 4th edition of Hecht (published by Addison-Wesley). Since the 5th edition changed only ~15% of problems, this manual covers most of the core mechanics and wave optics problems. Buy it used for $10–20. For each of these, the manual provides worked