Question

A double convex lens has two surfaces of equal radii 'R' and refractive index n = 1.5, find the focal length 'f'
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Answer 1

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Answer 2

Answer:

Given

Radius of curvature =R

focal length =f

Refractive index, μ=1.5

From lens maker's formula

f

1

=(μ−1)[

R

1

1

−

R

2

1

]

f

1

=(1.5−1)[

R

1

+

R

1

]

=0.5×

R

2

f

1

=

R

1

f=R