Here we have given that,
Ho = 4 cm
Hi = y' = 7 cm
U = 8 cm
n = 1.52
a)
Magnification will be given as
m = - Ho/Hi = 7/4 = -1.75
b)
Also from the magnification relation we have,
m = 1.75 = V/U
v = s = 1.75×8 = 14 cm
c)
Focal length will ve given as,
f = V×U/U-V = -14×8/-8-14 = 5.0909 cm
Which is our required focal length of the lense.
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