Question

Two identical diverging lenses are separated by 14 cm. The focal length of each lens is...

Two identical diverging lenses are separated by 14 cm. The focal length of each lens is -9.5 cm. An object is located 3.9 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right

Homework Answers

Answer #1

D = distance between two lens = 14 cm

for the left diverging lens :

f = - 9.5 cm

do = object distance = 3.9 cm

di = image distance = ?

using the lens equation

1/do + 1/di = 1/f

1/3.9 + 1/di = 1/(-9.5)

di = - 2.76 cm  

for the diverging lens on right

f = - 9.5 cm

do = object distance = 2.76 + 14 = 16.76 cm

di = image distance = ?

using the lens equation

1/do + 1/di = 1/f

1/16.76 + 1/di = 1/(-9.5)

di = - 6.06 cm

so the image is 6.06 on the left of right diverging lens

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