Keplerian Telescope

The Keplerian Telescope, invented by Johannes Kepler in 1611,1611, is an improvement on Galileo's design. It uses a convex lens as the eyepiece instead of Galileo's concave one. The above is a schematic design of the Keplerian Telescope, where the center of the objective and eyepiece lenses are L1L_1 and L2L_2, respectively. When the distance between them is LL, the image of the moon becomes the sharpest. If the focal length of the eyepiece lens is f,f, then which of the following statements is NOT correct?

a) The focal length of the objective lens must be larger than L.L.

b) The image shown by the eyepiece lens is a virtual image.

c) The distance between the image created by the objective lens and the center of the eyepiece lens is smaller than f.f.

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