How would you calculate the refractive index?

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To calculate the refractive index of a plano-convex lens with a focal length of 0.2 m and a convex radius of curvature of 0.07 m, the lensmaker's equation is used: 1/f = (n-1)(1/r1 - 1/r2). Here, r1 is 0.07 m and r2 is considered infinite for the flat side. The equation can be rearranged to solve for the refractive index (n) once the values are substituted. This approach provides a clear method to find the refractive index based on the given parameters.
Vaish

Homework Statement


A plano-convex lens has a focal length f= 0.2 m. The radius of curvature of the convex side of the lens has been determined to be 0.07 m and the radius of curvature of the flat side is assumed to be infinite.
Calculate the refractive index of the lens.

Homework Equations


1/f = (n-1)(1/r1-1r2)

The Attempt at a Solution


I have no idea where to start from.
 
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You have ##f## and you have ##r1## and ##r2##, along with the equation relating the three to the index of refraction, do you not?
 

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