A converging lens (f=11.7 cm) is located 29.0 cm to the left of a diverging lens (f-8.71 cm). A postage stamp is placed 53.5 cm to the left of the converging lens. (a) Locate the final image of the stamp relative to the diverging lens. (b) Find the overall magnification. (a) Number i Units
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- An object is in front of a converging lens (f = 0.35 m). The magnification of the lens is m = 2.5. (a) Relative to the lens, in what direction should the object be moved so that the magnification changes to m = -2.5? (b) Through what distance should the object be moved? (a) (b) Number i eTextbook and Media Save for Later Attempts: 0 of 5 used Units Submit AnswerAn individual is nearsighted; his near point is 11.0 cm and his far point is 51.0 cm. (a) What lens power is needed to correct his nearsightedness? 1.96 X The response you submitted has the wrong sign. diopters (b) When the lenses are in use, what is this person's near point? 11 X Your response differs from the correct answer by more than 10%. Double check your calculations. cmphy
- A converging lens (f = 12.3 cm) is located 44.9 cm to the left of a diverging lens (f = -7.16 cm). A postage stamp is placed 38.3 cm to the left of the converging lens. (a) Locate the final image of the stamp relative to the diverging lens. (b) Find the overall magnification. (a) Number i (b) Number Units UnitsCompute the focal length of a diverging thin lens made of flint glass, whose refractive index is 1.66 and is immersed in air having refractive index 1. The radii of the spherical surfaces of the lens are 10 cm and 20 cm. Select one: O -30 cm O O -10 cm 30 cm 10 cmEXPERIMENT - FOCAL LENGTH OF THE GIVEN LENS Objective: (a) To investigate the properties of the given lens. (b) To investigate the images formed by the lens for various object positions. (c) To measure the focal length of the lens. Formulae: 1 1 + u 1 1 P = f V Apparatus used in this Experiment: Experimental data Physical Quantity Its Value in cm Image distance in cm 24.5 Object distance in cm 17 Answer the following: Question - 1 Among the 2 distances mentioned in the table, which distance is fixed and which is measured ? 1. Fixed distance - 2. Measured distance -
- not a graded assignmentIn sports photography, one often needs a long telephoto lens with a large aperture. As a designer, you will work with engineers to design some new lens.“ (i) Suppose you want to have an 500mm lens with aperture f/4. Calculate the required iris diameter. Round your answer to the nearest integer and state its unit. “ |(ii) Suppose you want to have a 700mm lens with a surface area of 12271.8463mm². Calculate the f-number. Correct your answer to 2_decimal places.Two converging lenses, both with focal lengths 34.9 cm are placed a distance 78.9 cm apart. An object is placed 87.5 cm from the 1st lens. Where is the final image located relative to the 2nd lens? Let + be the back side and - be the front side regarding this distance from the 2nd lens. Measure this in cm.
- Two lenses (f1=100 mm, f2=-150 mm) are used to form an image of a candle on an observation screen. The distance between the lenses is kept small and is measured to be 3.5 cm. The distance of the candle from the center of both lenses is measured to be 82 cm. The distance of the image from the center of both lenses is measured to be 22 cm. (i) What are the experimental focal length of the two combined lenses? (a) 60 mm (b)1040 mm (c) 576.43 mm (d) 173.47 mm (ii) What are the theoretical focal lengths of the two combined lenses? (a) -50 mm (b) 176.47 mm (c) 280.37 mm (d) 52.63 mmA contact lens is made of plastic with index of refraction n = 1.5. The lens has an outer radius R1 = +2.0 cm and inner radius of curvature R2 = +2.5 cm. Find the focal length and the power of the lens (a) in air (b) in water (nwater = 1.33).