Consider a concave, spherical lens. Discuss the image formation as a function of

Question

Consider a concave, spherical lens. Discuss the image formation as a function of light source position from a distance far from the lens, to a position close to the lens. Be sure to state what fundamental principle lies behind the functioning of a lens. Draw ray diagrams for the image formation when the source is at one-half the focal length and twice the focal length, determine the image position for each with an optics formula.

Please help! If anything please help with the ray diagram of the source at one-half the focal point.

Explanation / Answer

Shoudnt the image be real since it's concave.

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