will thumbs up if correct An 2 cm object is placed 30 cm to the of a converging

Question

will thumbs up if correct

An 2 cm object is placed 30 cm to the of a converging lens of focal length 20 cm. What is the location of the images. At 12 cm to the left of converging lens At 60 cm to the left of converging lens At 12 cm to the right of converging lens At 60 cm to the right of converging lens At the same situation as question 1, what the image looks like? It is a erect image with 4 cm tall O It is a erect image with 6 cm tall It is a inverted image with 4 cm tall It is a inverted image with 6 cm tall

Explanation / Answer

1) for converging lense focal length f is positive

1/f = 1/do + 1/di

1/20 = 1/30 + 1/di

1/di = (1/20)-(1/30)

di = 60 cm

so the answer is 60 cm to the right of the converging lens if the object is placed on the left of the converging lens

2) magnification m = -di/do = hi/ho

-60/30 = hi/2

hi = -4 cm

4 cm inverted

so the answer is it is a inverted image with 4 cm tall

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