1."The magnification of an image produced by a mirror can be either
-1 or +1".
(a)Name the mirror which can produce either of such images. Write
its nature.
(b)Define its principal focus.
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Answer:
concave mirror
Explanation:
a concave mirror produces -1 images when the object is at infinity. it produces +1 images when the object is between c (centre of curvature) and the pole.
the principal focus is the point where the image is formed when the object is at infinity. it is on the principal axis.
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