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Question

If the Flash simulation above is not working, try loading it in a separate page by clicking this link: PhET Geometric Optics Simulation

http://phet.colorado.edu/sims/geometric-optics/geometric-optics_en.html

. Lens-Maker's Equation In the animation you can select the radius of curvature of the lens surface and also the refractive index of the lens material. Assume that you have a material with a refractive index of 1.64.

What value of the radius will give you a lens with a focal length of 70 cm? (Units needed.) Hint: use the Lens-Maker's Equation. Radius needed, r =

Explanation / Answer

Given refractive index n = 1.64

focal length f = 70 cm

the lens maker's equation is

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

here R2 = - R1 = r

1/f = (n-1) * (2/r)

1/70 = (1.64-1) * (2/r)

r = 89.6 cm

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