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Analysis of a Biconvex-Biconcave Optical System with Aperture

This study explores a complex optical system comprising a biconvex lens (L1) and a biconcave lens (L2), along with an aperture (A), detailing their configurations and interactions. The biconvex lens has a 6 cm diameter and a 6 cm focal length, while the biconcave lens also has a 6 cm diameter but a focal length of -10 cm. The system's arrangement is examined to identify which element acts as the aperture stop (AS), as well as the sizes and positions of the entrance and exit pupils (EnP and ExP), and the intermediate and final images formed by the lenses.

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Analysis of a Biconvex-Biconcave Optical System with Aperture

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  1. Example: An optical system is made up of a biconvex thin lens L1 of diameter 6 cm and focal length f1 = 6 cm, a biconcave thin lens L2 of diameter 6 cm and focal length f2 = 10 cm and an aperture A of diameter 3 cm. The aperture A is located 3 cm in front of lens L1, which is located 4 cm in front of L2. An object OP, 3 cm high, is located 18 cm to the left of L1. • Determine which element (A, L1 or L2) serves as the aperture stop AS. • Determine the size and locations of entrance (EnP) and exit (ExP) pupils. • Determine size and locations of the intermediate image of OP formed by L1 and the final image of the system.

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