Dear Student, 1v+1u=1f1v=1f-1u1v=u-fufv=ufu-fvu=fu-fFor concave mirror,m=-vu=-fu-fm=ff-u1 8=ff-uf=94uFor convex mirror, we replace f with -fm=--fu--fm=fu+fm=94uu+94u=913=0 69 Regards

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Dear Student,

\frac{1}{v} + \frac{1}{u} = \frac{1}{f} \frac{1}{v} = \frac{1}{f} - \frac{1}{u} \frac{1}{v} = \frac{u - f}{uf} v = \frac{uf}{u - f} \frac{v}{u} = \frac{f}{u - f} For concave mirror, m = - \frac{v}{u} = - (\frac{f}{u - f}) m = \frac{f}{f - u} 1.8 = \frac{f}{f - u} f = \frac{9}{4} u For convex mirror, we replace f with - f m = - (\frac{- f}{u - (- f)}) m = \frac{f}{u + f} m = \frac{\frac{9}{4} u}{u + \frac{9}{4} u} = \frac{9}{13} = 0.69

Regards

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