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177. Choose the true sentence about lenses:A.The lens is a centered optical system consisting of three spherical orcylindrical diopters (one of them can be flat) that delimits a transparentmedium.B.The lens is a centered optical system consisting of two plane diopters thatdefine a transparent medium.C.Converging lenses transform a light beam parallel to the main optical axis intoa diverging beam.D.Diverging lenses are thinner in the middle and thicker at the endsThe focal length f is always positive in the case of converging lenses (the focibeing real) and negative for divergent lenses (when the foci are virtual)

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