A spherical mirror and a thin spherical lens has a focal length of - 15 cm the mirror and lens are likely to be
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Sperical mirror --> Concave mirror
Thin lens --> Concave lens
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A spherical mirror and a thin spherical lens has a focal length of - 15 cm the mirror and lens are likely to be-: concave
Both concave by the convention the focal Length of a concave mirror and a concave lens as taken as negative both the spherical mirror and the thin spherical lens are concave in nature.
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