When an object is placed at 30 cm in front of a concave mirror, image of the
same size is formed. What is the focal length of the mirror?
mogo formed by a concave mirror and of a
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Explanation:
given same sized image is formed.
I,e u=-30cm, v= -30cm
that means the object is placed at the center of curvature.
hence the focal length is -30/2= -15 cm
the minus sign just suggests that the focal length is on the left side of the mirror as per the standard convention.
F= -15cm
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