Question

The radius of the curvature of one of the surfaces of a biconvex lens is 5...

The radius of the curvature of one of the surfaces of a biconvex lens is 5 times superior to the other radius on the other side.

the lens is made of glass with a refraction index of 1.53, the power is 5D. Determine the radius of curvature on both sides.

I used the equation of the Lensmaker's Equation for a Thick Lens, but i cant match the answer give, which is R1=12,7mm and R2=-63,5mm.

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Answer #1

Given,

( negative sign indicates they are on the opposite sides)

as we don't know the thickness, we will assume it to be zero, and treat the lens as a thin lens.

using Lensmaker's equation,

but,

So, the radii of the sides of the lens are 12.7 cm and -63.5 cm.

( The answer is off by one decimal point if it is in mm, please check the unit)

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