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Question:

If you are to determine the focal length of a convex lens, you should have:

a lens holder, a screen and a scale

a convex lens, a screen, holders for them and a scale

a convex lens and a screen

a convex lens and a lens holder

Solution:

To determine the focal length of convex lens, we need a convex lens, a screen on which image is formed, holders for screen and the lens and a scale to measure the focal length of the lens.