a spherical mirror and thin spherical lens have each focal length of-15 cm , the mirror and the lens likely to be
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the mirror and lens are likely to be concave
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A spherical mirror and a thin spherical lens have each a focal length of -15cm. The mirror and lens are likely to be. Both concave. ... As per New Cartesian Sign Conventions, the focal length of a concave mirror and focal length of a concave lens, both are negative.
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