Many optical instruments, such as telescopes and microscopes, use a combination of two or more lenses. The thin lens formula is a mathematical way to do ray diagrams with algebra instead of drawing lines on graph paper. In lens combinations, the image formed by the first lens becomes the object for the second lens (this is where object distances may be negative). In this video , i'm going to discuss the solved problems using thin lens formula in combination of lenses. How to draw the related ray diagrams also discussed here.

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Thumbnail: Use thin lens formula in combination of lenses