The near point of a person's eye is 72.0 cm. (Neglect the distance from the lens to the eye.) (a) To see objects clearly at a distance of 26.0 cm, what should be the focal length of the appropriate corrective lens?  cm (b) To see objects clearly at a distance of 26.0 cm, what should be the power of the appropriate corrective lens?  diopters

(a) What is the power and the focal length of the eye when viewing an object 50.0 cm away? (b) Calculate the power and the focal length of the eye when viewing an object 3.00 m away.

8. A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of -2.50 diopters. He would like a prescription for contact lenses. What is the correct contact lens prescription if he normally wears his eyeglasses a distance of 3.0 cm from his eyes? diopters oof

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

In 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 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 mm

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?

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A) how far from the object should this lens be placed? B) what focal length eyepiece would give an overall magnification of -55? C) what focal length eyepiece would give an overall magnification of -100?