Question

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

• A. a convex lens and a screen
• B. a convex lens and a lens holder
• C. a lens holder, a screen and a scale
• D. a convex lens, a screen, holders for them and a scale

Answer 1

Answer: (D)

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

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.