UPSEE Solved Model Paper 1

since object and image is real
Object distance = −x1
Image distance = x2
= x0 = x1+x2 ;

1

x2

−

1

−x1

=

1

f

⇒ x1+x2 =

x1x2

f

=

x1x2

f

Solving above equation for real values of

x1

x2

we get
x0 = 4f
∴ K = 4