magnifying glass enlarges the image of a nickel by M-1.9 when the lens is held p-5.3 cm from the object. (a) Find the focal length fof the lens. 11.4 cm (b) How far from the nickel do you need to hold the same lens to obtain a magnification of M-2.6? cm
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- 6) An object is placed very far in front of a converging lens of focal length 13.2 cm. Find the location of the image, be sure to indicate which side of the lens the image is on.22 The focal length of a simple magnifier is 8.00 cm. Assume the magnifier is a thin lens placed very close to the eye. (a) How far in front of the magnifier should an object be placed if the image is formed at the observer's near point, 25.0 cm in front of her eye? (b) If the object is 1.00 mm high, what is the height of its image formed by the magnifier?Ch 26, problem 7 An object is 21.0 cm from a converging lens, and the image falls on a screen. When the object is moved 3.50 cm closer to the lens, the screen must be moved 2.20 cm farther away from the lens to register a sharp image. Determine the focal length of the lens.
- 7) Both lenses of a compound microscope have focal lengths of 1 cm. The barrel length is 26.95 cm. Deteimine the total magnification for an object placed 1.04 cn below the objective,A) How far from a 59.0- mm -focal-length lens must an object be placed if its image is to be magnified 3.50× and be real? B)An optometrist needs to prescribe corrective lenses for a person whose near point is q = 58.8 cm. If the patient is to see objects clearly at a distance of p = 25.0 cm, calculate the following. (Neglect the distance from the lens to the eye.) (a) focal length (in cm) of the appropriate corrective lens cm (b) power (in diopters) of the appropriate corrective lens diopters
- A camera is equipped with a lens with a focal length of 30 cm When an object 200 cm away is being photographed, how far from the ?9?lm should the lens be placed?Problem 12: A student wears eyeglasses of power P = -3.75 diopter to correct nearsightedness. The glasses are designed to be worn d = 1.3 cm in front of the eye. Part (a) Input an expression for the far point the student can see without correction, do. Part (b) Numerically, what is the distance in meters?