Question

an object is placed at 16cm in front of a concave mirror of focal length 12 .if the object is shifted by 8 cm,find the shift in image position

Answer 1

1/f=1/v+1/u
f=-12 cm
u=-16 cm

1/v=1/f-1/u
1/v=u-f/uf
1/v=-16+12/192
=-4/192
=1/-48
v=-48cm

m= -v/u
= -48/16
=-3cm
u' =16+8
=24
m=-v'/u'
-3=v'/24
-3*24=v'
v'=-72cm

shift in the image position= v'-v
=-72+48
=-24 cm

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