When concave lens of 25 CM focal length and convex lens of 30 cm focal length kept both in contact in the focal length of compound lens will be what?
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When you put lenses together, their power actually adds. ... Since you said a real image is formed, that means the absolute value of the power of the concave lens in smaller than the power of the convex lens. You know that because concave lenses don't make real images.
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