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Biconvex lenses with a diameter of 5 cm and null thickness on the borders. Conside a...

Biconvex lenses with a diameter of 5 cm and null thickness on the borders.

Conside a point luminous point P that is in front of the lense, in a axis that goes through the center of lense and produce a real image on the other side.

The distance of both the object and the image to a plane that bisects the lense is 30 cm. the refraction index is 1,52.

Using the equivalence of the optical paths , calculate the thickness of the lense in the center.

I dont understand here how to use equivalence of the optical paths. Is it possible to calculate the focal length of the lense, if you the image and object that are the same?

Science   Advanced-Physics   
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