A spherical mirror and a spherical lens each have focal length of -10cm. the mirror is likely to be
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a spherical mirror and a spherical lens each have a focal length of -15 cm. themirror and the lens are likely to be : (a)both concave.
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Convex mirror always have a negative focal length. The power of an optical element is calculated as 1/focal length and is always negative for a diverging element. When the image distance is negative, it appears behind the mirror and is virtual in nature and convex mirror produces virtual and erect image.
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