Question

two tine lenses of power 3D and-2D are place in contact than find the power and focal length of the lens combination​

Answer 1

Power, P=P

1

+P

2

P=(2+3)D

=5D

f=

P

100

=20cm

By lens formula,

v

1

−

u

1

=

f

1

v

1

−

−30

1

=

20

1

v

1

=

60

1

v=60 cm

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