Pulse in a food processor until very finely chopped. Combine milk, flour, salt, pepper and nutmeg in a large saucepan. Cook over medium heat, whisking, until thickened, 2 to 4 minutes. Remove from the heat and stir in half a cup of cheddar, cottage cheese and the spinach.
An aspheric lens or asphere is a lens whose surface profiles are not portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens.
Construction of a Fresnel lens from its correspond-. ing asphere. Each groove of the Fresnel lens is a. small piece of the aspheric surface, translated to-. ward the plano side of the lens. The tilt of each sur-. face must be modified slightly from that of the. original portion of aspheric surface, in order to.