The angular magnification of a microscope is 440× when the final image is at infinity. The optical tube length is 10 cm and the focal length of the objective is 7 mm. What is the focal length of the eyepiece? cm
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- An object is placed in 5 cm in front of a lens, producing an image that is upright and 3 times larger, m = +3. Determine the position of the image and the focal length of the lens.An object is placed at a distance of 10.0 cm from a convex lens with a focal length of 15.0 cm, and a virtual image is formed . Calculate the magnification factor for the image.A microscope objective with a magnification of 20 is used in a microscope with a magnification of 56. Find the focal length of the ocular if the ocular's image is formed at the eye's near point, 27 cm from the eye. Neglect the distance between the eye and the ocular.
- In a compound microscope, the objective has a focal length of 1.0 cm, the eyepiece has a focal length of 2.0 cm, and the tube length is 25 cm. What is the magnitude of the overall magnification of the microscope?An object is placed 36cm to the left of a converging lens. The resulting image is five times the size of the object and projected onto a screen. What is the focal length of this lens?Contact lenses are placed right on the eyeball, so the distance from the eye to an object (or image) is the same as the distance from the lens to that object (or image). A certain person can see distant objects well, but his near point is 46.0cm from his eyes instead of the usual 25.0cm .If the correcting lenses will be contact lenses, what focal length lens is needed ?