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given
u = - 20cm
f = r/2= 30/2=15 cm
we know that
1/f=1/v+1/u
1/15=1/v-1/20
1/v=1/15+1/20
1/v = 7/60
v= 60/7
the image is same side of object, erect, enlarged
we know that
-v/u = hi/ho
(-60/7)/(-20)=hi/5
hi=15/7
u = - 20cm
f = r/2= 30/2=15 cm
we know that
1/f=1/v+1/u
1/15=1/v-1/20
1/v=1/15+1/20
1/v = 7/60
v= 60/7
the image is same side of object, erect, enlarged
we know that
-v/u = hi/ho
(-60/7)/(-20)=hi/5
hi=15/7
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