A thin lens has a focal length of 25.0 cm. (a) Locate the image when the object

Question

A thin lens has a focal length of 25.0 cm.

(a) Locate the image when the object is placed 26.7 cm in front of the lens. (Enter a negative distance if the image is in front of the lens.)
cm from the lens Choose the correct description of the image. (Select all that apply.)

uprightreducedrealinvertedenlargedvirtual

(b) Locate the image when an object is placed 23.7 cm in front of the lens. (Enter a negative distance if the image is in front of the lens.
cm from the lens Choose the correct description of the image. (Select all that apply.)

reducedvirtualuprightrealenlargedinverted

Explanation / Answer

a) We have:

1/s + 1/s' = 1/f

1/26.7 +1/s'= 1/25

s' = 392.6 cm

the iamgen is real and inverted larged

b) we have:

1/s +1/s' = 1/f

1/23.7 + 1/s' = 1/25

s' = -455.7 cm

the iamgen is virtual upright larger imagen

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