176. Choose the true statement regarding the foci of the spherical diopter:A. The focus of the converging diopter is virtualBThe focus of the diverging diopter is realC.If the medium with higher refractive index is inside the sphere, the diopter isdivergentD.The distance from the main focal point to the center of the diopter is called thefocal lengthE.The principal focus is the point on the principal optical axis where the rayscoming towards the diopter parallel to the principal optical axis converge

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