A convex lens is placed on a stand, and an object is placed at a distance of from the lens. The observer looks at the object’s image formed by the lens, which appears to be at a distance
on the other side of the lens. Determine the focal length
of the convex lens using the lens formula.
Step 1: Use the lens formula to relate the object distance , image distance
, and the focal length
of the lens.
Step 2: Solve the lens formula for the focal length .
So, the focal length of the convex lens is
.
Therefore, the correct answer is D.
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