Problem 34.66 A 1.9-cm-tall candle flame is 1.7 m from a wall. You happen to hav

Question

Problem 34.66 A 1.9-cm-tall candle flame is 1.7 m from a wall. You happen to have a lens with a focal length of 32 cm Part A How many places can you put the lens to form a well focused image of the candle flame on the wall? N- 2 places Submit My Answers Give Up All attempts used; correct answer displayed Part B For each location, what is the height of the image? Express your answers using two significant figures. Enter your answers numerically separated by a comma. hi, he Submit My Answers Give Up Part C This question will be shown after you complete previous question(s).

Explanation / Answer

here,

let the image distance and the object distance be di and do

di + do = 170 ...(1)

and using the lens formula

1/f = 1/di + 1/do

1/32 = 1/di + 1/do ....(2)

from (1) and (2)

do1 = 42.8 cm and di1 = 127.25 cm

or

do2 = 127.25 cm and di2 = 42.8 cm

a)

so there are two places , N = 2

b)

the object height , ho = 1.9 cm

the height of image , h1 = ho * ( - di1/do1)

h1 = - 5.65 cm

the height of image , h2 = ho * ( - di2/do2)

h2 = - 0.64 cm

c)

both images are inverted

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