Answer:
(a) Concave. (b) \[v+u\] (c) A concave lens always forms a virtual and diminished image that forms on the same side of the object. Therefore the distance between the object and image is\[u-v\]( since \[u>v\]). (d) A converging lens is a convex lens and it always forms a virtual image that is magnified and that forms away from the object on the same side of the lens. Therefore the distance between object and image is\[v-u\]( since\[v>u\]).
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