Plane mirrors, convex mirrors, and diverging lenses can never produce a real image. A concave mirror and a converging lenswill only produce a real image if the object is located beyond the focal point(i.e., more than one focal length away). Are real images always inverted? REAL image is...
Advantageous embodiments of inventive projection objectives have an object/image spacing L, and a focal length f′ and use an immersion medium with a refractive index nI, the following condition being fulfilled: L/f′*nI>2.5. Compact systems with short focal lengths are possible when this conditi...