UPSEE Solved Model Paper 5

when the lens is at L1 a magnifies image l1M1 is obtained

I1M1

OB

=

v

u

... (1)
when the lens is at L2 a diminished image I2M2 is formed

I2M2

OB

=

u

v

... (2)
Form the figure
v + u = D
v - u = d
Adding 2 v = D + d
v =

D+d

2

... (3)
Subtracting
2u = D - d
u =

D−d

2

... (4)

(2)

(1)

=

I2M2

I1M1

=

u2

v2

=

(D−d)2

(D+d)2