This print-out should have 16 questions. Multiple-choice questions may continue

Question

This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page - find all choices before answering. A real object is located at 7/5 f to the left of a convergent lens with a focal length f as shown in the figure. What kind of image is formed? virtual, inverted, and smaller virtual, erect, and larger real, inverted, and smaller real, erect, and larger real, inverted, and larger virtual, inverted, and larger real, erect, and smaller virtual, erect, and smaller What is the image distance q_2, to the right of the lens?

Explanation / Answer

001 :

do = object distance

since object distance do > f (focal length) ,and < 2f , hence image formed is real , inverted and larger.

002 :

do = object distance = 1.4 f

di = image distance

f = focal length

using the equation

1/f = 1/do + 1/di

1/f = 1/(1.4f ) + 1/di

di = 7f/2

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