write the image formula for plane surface
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the object is at infinity, the image is formed at the focus of the lens. Thus, for u = ∞, v = f. Then the equation (4) becomes. This is called the lens maker's formula, because it tells what curvature will be needed to make a lens of desired focal length.
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a mirror is that reflector surface which reflect maximum number of light rays. Ex:-silver polished glass still water surface.
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