A person has a far point of 8.0 m. What kind of lens of (diverging or converging

Question

A person has a far point of 8.0 m. What kind of lens of (diverging or converging) is needed to enable the person to view an object that is located at infinity? What is the focal length of that lens? You work in a tissue lab and are asked to purchase a new microscope that is different from the others that already exist in the lab. There are constraints: you have to use a microscope objective with a long working distance (the distance from the objective lens to the object you are imaging) and a magnification of -50. You select a Mitutoyo M Plan Apo No. 378-814-4. which has a working distance of 5.2 mm. (a) What is the focal length of the objective? (b) What is the focal length of an eyepiece that will provide an overall magnification of -250? Assume a near point of 25.0 cm. A negative (diverging) lens is used to form a virtual image of a nearby (real) object. If the object is moved further away from the lens, a new virtual image is formed. Which of the following statements are supported by observation? The new virtual image is (choose one)... A. ...further from the lens than the original image. B. ... closer to the lens than the original image. C. ...at the same distance from the tens as the original image. The new virtual image is (choose one)... D. ... bigger than the original image. E. ... smaller than the original image. F. ... the same size as the original image.

Explanation / Answer

Hi,

Please find below solution for 8th question,

1/f = 1/do + 1/di

f = di = -8 m

power is 1/-8=-0.125 diopter

Lens is diverging

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