Identify the device used as a spherical mirror or lens in following cases when the image formed is virtual and erect in each case.
A) Object is placed between focus and device ,image formed is enlarged and same side as that of the object.
B)Object is placed between infinity and device,image formed is diminished and between focus and optical centre on the same side as that of the object.
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(a) convex
(B) Concave
(B) Concave
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