Optics Reflection

I learned about optics. How there is concave and convex mirrors and lenses. I learned how to draw the mirror and lens diagram to figure out if the image can be formed or if it becomes virtual. Concave mirrors usually form real images, but sometimes they don't, and convex mirrors always form virtual images no matter what. With lenses it is exactly the same.
In this unit actually understanding what happens with mirrors and lenses was difficult, the equations and stuff were easy but actually understanding it was difficult for me. Example like knowing when the focal length was negative and just knowing when a number is negative.
My problem solving skills have gotten better because now i know now what i need to work on in the future. Like listen more attentively during class, and understand the labs that we do. My strengths in this unit were solving the equations and that was about it. My weaknesses were drawing the diagrams, and answering the questions about optics.