Find the focal length of the glass lens in the figure (Figure 1) . Take R1 = 20 cm and R2 = 49 cm.
and what is the unit?
The concept required to solve this problem is the lens maker formula of biconvex lens.
Initially, write an expression for lens maker formula of biconvex lens. Finally, calculate the focal length of the glass lens.
The expression for the focal length of the two different radii of curvatures is as follows:
Here, is the refractive index of glass, is the refractive index of air, and are the radii of curvature, f is the focal length.
Substitute 1.5 for and 1.0 for in the equation .
Thus, the expression for the reciprocal of focal length is,
Substitute for and for in the equation .
Solve for f.
Ans:
The focal length of the biconvex lens is 28.40 cm.
Find the focal length of the glass lens in the figure (Figure 1). Take R1...
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