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Lenses

Ray diagram for biconvex and biconcave lenses.

Drag the point f (light blue) to change the focal length of the lens. Drag it to the opposite side of the lens to change the lens type. Drag the point E (light blue) to change the location (horizontal drag) and height (vertical drag) of the object. The thickness of the lens does NOT correspond to the focal length.

Lenses

Questions:

What phenomenon does the failure of all 3 lines to cross neatly at a single point demonstrate? When is the image right side up? When is the image real? When is the image larger than the object? What happens when you drag f through the lens to the other side? How is that related to the sign conventions for lenses?