# Solution - Refraction at Spherical Surfaces and by Lenses - Combination of Thin Lenses in Contact

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ConceptRefraction at Spherical Surfaces and by Lenses - Combination of Thin Lenses in Contact

#### Question

Two thin convex lenses L1 and L2 of focal lengths f1 and f2, respectively, are placed coaxially in contact. An object is placed at a point beyond the focus of lens L1. Draw a ray diagram to show the image formation by the combination and hence derive the expression for the focal length of the combined system.

#### Solution

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