In the experiment for finding the focal length of a convex lens using a concave lens, why is the convex lens necessary?
University of Ilorin PHY108 2025 past question
- The concave lens alone cannot form a real image that can be used as a virtual object for further measurement
- The convex lens measures the refractive index of the concave lens
- The convex lens replaces the plane mirror in the experiment
- The convex lens reduces spherical aberration in the setup
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