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  4. Two convex lenses separated by a distance are brought in contact. The focal length of the combination

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Q. Two convex lenses separated by a distance are brought in contact. The focal length of the combination

Ray Optics and Optical Instruments

Solution:

$P = P_1 + P_2 - x P_1 \, P_2$. When put in contact x -0
. When P increases and focal length decreases