Question

Write the lens formula and expand it.

Answer 1

Answer:

Lens maker's formula:

f

1

=

n

0

n

lens

−n

0

(

R

1

1

−

R

2

1

)

where, f is focal length

n

lens

is refractive index of lens

n

0

is refractive index of surrounding (for air, n

0

=1)

R

1

and R

2

are radius of curvature of each surfaces.