(1) structure: convex lens is composed of two sides ground into a spherical transparent mirror; concave lens is composed of two sides are ground into a concave spherical transparent mirror (2) on the role of light: convex lenses mainly on the light to play the role of convergence; concave lenses mainly on the light to play the role of dispersion (3) the nature of the image: convex lenses are refractive imaging, into the image can be positive, inverted; virtual, real; put, shrink, to play the role of convergence; concave lens is a refractive imaging can only be reduced into the orthogonal image, to play the role of astigmatism; convex mirrors are reflected; concave mirrors are reflective imaging

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