a concave mirror forms a real image that is twice the size of the object .ifthe object is 20cm from mirror the radius of curvature of mirror must be about
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Answer:
radius of curvature of mirror must be about -40 cm.
Explanation:
u= -20 cm
h' = 2h
m= h'/h= -v/u
=> 2h/h = - v/-20
=> 2=v/20
=> v = 40
•.• 1/f=1/u+1/v
= 1/-20 + 1/ 40
= -2+1/40= - 1/40
.•. f= - 40 cm
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Answer:
80 cm
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