– Hecht’s Optics is most commonly found in 4th and 5th editions (Pearson). The 3rd edition is older but still used in some courses. A solutions manual for the 3rd edition definitely exists, but it’s unofficial in most cases — Pearson never widely published an official one for students, only for instructors.
Finding an "updated" solution manual specifically for the 3rd Edition of Eugene Hecht’s
PDF Format.
Available for download is the updated Solutions Manual for "Optics" by Eugene Hecht, 3rd Edition.