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![For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1094588/original_16.png)
For the lens arrangement shown below, the focal length of equivalent system is in the form of 50x13 . Find the value of x.[Radii of curvature, focal lengths and refractive indices are
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6. Define focal length of a lens. Derive the expression equivalent focal length of combination of two thin convex lenses in contact. (U) 7. Which phenomenon is responsible the formation of rainbow?
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