A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?

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Af2 + f1

Bf1f2/f1-f2

Cf2 – f1

Df1f2/f2+f1

Correct answer

B. f1f2/f1-f2

Explanation

f1f2/f1-f2 is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.

A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________? - Answer and Explanation | Academy of Pakistan