A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of...

Question 1 Report

A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

12cm

24cm

48cm

108cm

Answer Details

F = $\frac{u v}{u + v}$

v = 3u

18 = $\frac{3 u \times u}{3 u + u}$

u = 24cm

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