will rate if correct An object 2 cm tall is placed 10 cm to the left of a conver

Question

will rate if correct

An object 2 cm tall is placed 10 cm to the left of a converging lens of focal length 20 cm. What is the location of the image. At 10 cm to the left of converging lens At 20 cm to the left of converging lens At 10 cm to the right of converging lens At 20 cm to the left of converging lens The situation as above question, an object 2 cm tall is placed 10 cm to the left of a converging lens of focal length 20 cm. What the image looks like? It is a erect image with 1.5 cm tall It is a erect image with 4 cm tall t is a inverted image with 1.5 cm tall It is a inverted image with 4 cm tall

Explanation / Answer

Here,

3)

object height , ho = 2 cm

object distance , do = 10 cm

focal length , f = 20 cm

for image distance di

Using lens formula

1/f = 1/do + 1/di

1/20 = 1/10 + 1/di

di = -20 cm

the image is located at (at 20 cm to the left of converging lens)

4)

Now , for the image height hi

hi/ho = -di/do

hi/2 = 20/10

hi = 4 cm

the image is (it is erect image with 4 cm tall)

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