to what position (b,c,d on one of the focal points, or infinitely far away) must

Question

to what position (b,c,d on one of the focal points, or infinitely far away) must the object be moved in order to cause the change in the image described in each of the following about questions Homework: Lenses and Images (Due at the beginning of lab) mue How ie diterent than a real image ocrer " are, ocrtne|outgoing rys from point Oi lens system shown in the figure below. Initially The neat severnl questions r the object is at refer to the 4, and the image is formed at position o at position of the focal points, or infinitely far away) must (a) To what position (B,C.D n the image described in each of To what position (B.C.D, on one of the focal points, or infinitely far the object be mosed in order to cause the change in the image the following questions. Explain nestions. Esplain why moving the object to the position you identify brings about the required change in the image. #2 #1 . A C (b) The image moves closer to the lens, to position #2. (e) The images moves farther frorn the lens, to position #3 (d) The image becomes larger. HYS-204: Physics II Laboratory

Explanation / Answer

1/f = 1/u + 1/v

u = object distance

v = image distnace

f = focal length

u = (v*f)/(v-f)

magnification m = v/u = v*(1/u)

m = v*(1/f - 1/v)

m = (v/f - 1)

b)

here the image distance is decreased

from u = (v*f)/(v-f)

the object distnace increases

the object is moved to c

---------

c)

as the image distance increases

the object distance decreases

the object is moved to B

d)

here magnification is large

as m is very large, i.e m = infinity

from

m = (v/f - 1)

v = infinity

from lens equation

1/f = 1/u + 1/v

1/f = 1/u

u = f

the object is moved to f

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