Imagine that a spherical mirror gives an image magnified 5 times at a distance 5m.If so determine whether the mirror is concave or convex. How much will be the focal length of the mirror?
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Answer:
it is concave.
Explanation:
as a convex mirror always former. diminished image.
we know
magnification, m = v/u
5= -v/5 ( as u=-5 )
therefore v= -25
by mirror formula
1/f = 1/v + 1/u
f = uv/u+v
f = (-5)×(-25)/(-5)+(-25)
f= -25×5/30
f = -25/6 m
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