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  4. A convex lens of power +2.5 D is in contact with a concave lens of focal length 25 cm. The power of combination is

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Q. A convex lens of power $+2.5\, D$ is in contact with a concave lens of focal length $25 \,cm$. The power of combination is

Ray Optics and Optical Instruments

Solution:

Power of concave lens $=-\frac{1}{0.25}=-4 \,D$
Adding combination $=-4 \,D +2.5 \,D =-1.5 \,D$