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State whether the following statements are True or False.
$(a)$. A concave lens can be used to produce an enlarged and erect image.
$(b)$. A convex lens always produces a real image.
$(c)$. The sides of an object and its image formed by a concave mirror are always interchanged.
$(d)$. Art object can be seen only if it emits light.
$(a)$. A concave lens can be used to produce an enlarged and erect image. [False]
$(b)$. A convex lens always produces a real image. [False]
$(c)$. The sides of an object and its image formed by a concave mirror are always interchanged. [True]
$(d)$. Art object can be seen only if it emits light. [False]
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