A-symmetric-convex-lens-r1-r2--of-refractive-index-1-5-is-placed-in-air-medium-prove-that-the-focal-length-f-r1-r2-

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A symmetric convex lens(r₁=r₂) of refractive index 1.5 is placed in air medium.prove that the focal length f=r₁=r₂.

Asked by dipankar 4 months ago

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Answers (1)

By , 4 months ago

According to the lens maker's formula:

(1/f) = (?-1)(1/r₁ - 1/r₂)

Using sign convention, we can replace r₁ by +r₁ and r₂ by -r₁.

So, 1/f = (1.5-1)(2/r₁)

Thus, f = r₁ = r₂.

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