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) concave

Inner surface of steel spoon acts as concave mirror because it forms real, inverted and smaller size image than object.

It also forms virtual, erect and enlarged image when object is very closed to spoon.

(b) plane

Flat plate acts as plane mirror because it forms virtual, erect and same size image as object

its neither convex nor concave.

(c) convex

It is because the outer surface of round bottom steel bowl forms virtual, erect and small size image than object like convex mirror.

(d) concave

Reflectors of torches are concave in shape and acts as concave mirror to obtain parallel beam of light and good intensity.