A small object is placed to the left of a convex lens and on its optical axis. T

Question

A small object is placed to the left of a convex lens and on its optical axis. The object is 30 cm from the lens, which has a focal length of 42 cm. If the object is moved to a position 34 cm to the left of the lens, what will the image position be? (A positive value for p, or position, means the image is on the right side of the lens.)

Answer in cm please.

(b) Describe the nature of this new image. (Select all that apply.)

virtual

real

upright

inverted

enlarged

reduced

on the left side of the lens

on the right side of the lens

Explanation / Answer

apply -1/f = 1/u + 1/v

1/v = -1/f -1/u

v = - uf/(u+f)

v = - ((30+34)* 42)/(30+ 34+42)

v = -25.35 cm

since image is -ve, virtual , upright enlarged and to the left of the lens

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