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the points C, and C, denote the centres of curvatures, then the focal length of the thin lens is

Question

The points C<sub>1</sub> and C<sub>2</sub> denote the centres of curvatures, then the focal length of the thin lens is

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Solution

It seems like your question is incomplete. You mentioned points C and C, which I assume are the centers of curvature for the two surfaces of a thin lens. However, you didn't provide any specific values or distances.

In general, the focal length (f) of a thin lens can be calculated using the Lensmaker's equation:

1/f = (n-1)[(1/R1) - (1/R2)]

where:

  • n is the refractive index of the lens material,
  • R1 is the radius of curvature for the first surface (distance from C1 to the lens), and
  • R2 is the radius of curvature for the second surface (distance from C2 to the lens).

If you provide the specific values, I can help you calculate the focal length.

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