We combined a convex lens of focal length `f_(1)` and concave lens of focal lengths `f_(2)` and
Channel: Doubtnut
Date: 2020-08-23

We combined a convex lens of focal length `f_(1)` and concave lens of focal lengths `f_(2)` and their combined focal length was F .  The combination of these lenses will behave like a concave lens, if