A spherical mirror and a thin spherical lens have each a focal length of -15 cm the mirror and the lences are likely to be
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The mirror is likely to be Concave, while lens must be concave lens.
They have -ve focal length, because as per sign criteria, their focal length or focus lies in opposite to be +ve.
They have -ve focal length, because as per sign criteria, their focal length or focus lies in opposite to be +ve.
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Answer:
Concave mirror and concave lences
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