We have modified our intermediate optics laboratory to improve student understanding through the use of active learning. Our approach relies on the direct confrontation of misconceptions through the use of predictions, collection of data to support or refute the predictions, reconciliation of the predictions and observations, discussions, and leading questions. This method differs from the traditional approach in which students are provided a series of detailed instructions. Through the class and the laboratory we build conceptual understanding in subjects such as image formation by lenses and mirrors, ray optics, and elliptical polarization while fostering laboratory independence and helping students erect a new paradigm for learning.We present data indicating improved student understanding of optics through the course of the semester.