A stamp collector uses a lens with 7.5-cm focal length as a simple magnifier. The virtual image is produced at the normal near point (25 cm). (a) How far from the lens should the stamp be placed? (b) What is the expected angular magnification?

In a two-lens system, the focl length of the lens is f1 = 4.00 cm, and that of then lens 2 is f2 = 8.00 cm. The distance between the lenses is 16 cm. If an object O is 2.00 cm high and is placed 6.00 cm in front of the lens 1, where is the final image through the two-lens system?

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Consider a refracting telescope that is made with two converging lenses- an objective lens (focal length 1.00m) and an eyepiece (focal length 50.0mm). The lenses are separated by a distance of 1.025m. If the viewer is looking at a distance object, such as craters on the moon, where will the final image of the eyepiece be located? (Note that this may not be the optimum construction to provide the greatest magnification.)

An amateur astronomer decides to build a telescope from two lenses. One of the lenses has a focal length of 10.0 cm, and the other has a focal length of 1.4 cm. (a) Which lens should be the objective, for maximum magnification? (b) What will be the magnification of the telescope? (c) How long will the telescope tube be if the telescope is focused on a flower that is 1.00 meter away? (Keep four significant figures for this.)

The image distance for the lens of a person's eye is2.10 cm.Calculate the focal length of the eye's lens system for anobject (a) at infinity, (b) 500 cm from the eye, and (c) 25 cm from the eye.