A simple single-lens camera (convex lens) is used to photograph a man 1.7 m tall who is standing 4.0 m from the camera. If the man’s image fills the height of a frame of film (35 mm), what is the focal length of the lens?
Answer to relevant QuestionsTo photograph a full moon, a photographer uses a single-lens camera with a focal length of 60 mm. What will be the diameter of the Moon’s image on the film? (a) If a book is held 30 cm from an eyeglass lens with a focal length of – 45 cm, where is the image of the print formed? (b) If an eyeglass lens with a focal length of + 57 cm is used, where is the image formed? Two converging lenses L1 and L2 have focal lengths of 30 cm and 20 cm, respectively. The lenses are placed 60 cm apart along the same axis, and an object is placed 50 cm from L1 (110 cm from L2). Where is the image formed ...A converging glass lens with an index of refraction of 1.62 has a focal length of 30 cm in air. (a) When the lens is immersed in water, the focal length of the lens will (1) increase, (2) remain the same, (3) decrease. ...Two lenses, each having a power of + 10 D, are placed 20 cm apart along the same axis. If an object is 60 cm from the first lens (not in between the lenses), where is the final image relative to the first lens, and what are ...
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