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  4. A combination of two thin convex lenses of focal length 0.3 m and 0.1 m will have minimum spherical and chromatic aberrations if the distance between them is

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Q. A combination of two thin convex lenses of focal length $0.3\, m$ and $0.1 \,m$ will have minimum spherical and chromatic aberrations if the distance between them is

Ray Optics and Optical Instruments

Solution:

For minimum spherical and chromatic aberration $d=F_{1}-F_{2}=0.3-0.1=0.2\, m$