Question

A plano convex lens of refractive index μ1​ and focal length f1​ is kept in contact with another plano concave lens of refractive index μ2​ and focal length f2​. If the radius of curvature of their spherical faces is R each and f1​=2f2​, then μ1​ and μ2​ are related as :

Answer 1

Answer:

ANSWER

Given,

2f

2

1

=

f

1

1

=(μ

1

−1)(

∞

1

−

−R

1

)

From lens makers formula,

f

2

1

=(μ

2

−1)(

−R

1

−

∞

1

)

R

(μ

1

−1)

=

2R

(μ

2

−1)

2μ

2

−μ

2

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=1.