19. Two thin rods AB and CD welded on each other make a frame that is shown on a graph paper. This frame is placed in front of a converging lens of focal length 10 cm with the arm AB coinciding with the optical axis of the lens. By shifting the frame on the optical axis, if an image of exactly the same size as that of the frame can be obtained, find length of the rod AB. 1SOM
19. Two thin rods AB and CD welded on each other make a frame that is shown on a graph paper. This frame is placed in front of a converging lens of focal length 10 cm with the arm AB coinciding with the optical axis of the lens. By shifting the frame on the optical axis, if an image of exactly the same size as that of the frame can be obtained, find length of the rod AB. 1SOM
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Transcribed Image Text:19. Two thin rods AB and CD welded on each other make a frame that is
shown on a graph paper. This frame is placed in front of a converging
lens of focal length 10 cm with the arm AB coinciding with the optical
axis of the lens. By shifting the frame on the optical axis, if an image of
exactly the same size as that of the frame can be obtained, find length
of the rod AB.
A
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