Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is Leave a Comment / Light MCQs / By Gkseries Q. Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is A. 100 cm B. 25 cm C. 50 cm D. 30.3 cm Answer: 50 cm
