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Fill in the blanks:
$(a)$. The inner surface of a steel spoon acts as a ________ mirror.
$(b)$. The outer surface of a flat steel plate acts as a ________ mirror.
$(c)$. The outer shining surface of a round bottom steel bowl acts as a ________ mirror.
$(d)$. The inner surface of the reflector of a torch acts as a ________ mirror.
$(a)$. The inner surface of a steel spoon acts as a $\boxed{concave}$ mirror.
$(b)$. The outer surface of a flat steel plate acts as a $\boxed{plane}$ mirror.
$(c)$. The outer shining surface of a round bottom steel bowl acts as a $\boxed{convex}$ mirror.
$(d)$. The inner surface of the reflector of a torch acts as a $\boxed{concave}$ mirror.
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