An object is 20cm from a 4cm focal length converging lens, where is the image? N

Question

An object is 20cm from a 4cm focal length converging lens, where is the image? Not enough information 1/5 cm from the lens, and on the same side as the object 1/5 cm from the lens, and on the opposite side as the object 5 cm from the lens, and on the same side as the object 5 cm from the lens, and on the opposite side as None of the above You have two converging lenses, each has a focal length of 4 cm. They are 8cm away from each other. Can light from one side pass through both lenses? Yes No You paint the inside of a thin sphere with silver, cut off a portion, and then point the shiny t the sun. Can you start a fire? Yes No An object is 60cm to the left of a converging length with a focal length of 40cm, what is the image like? 1/3 as big, inverted 1/3 as big, upright Half as big, inverted Half as big, upright Twice as big, inverted Twice as big, upright Three times as big, inverted Three times as big, upright Infinity

Explanation / Answer

5.

f = focal length = 4 cm

do = object distance = 20 cm

di = image distance

using lens equation

1/di + 1/do = 1/f

1/di + 1/20 = 1/4

di = 5 cm

E) 5 cm from lens on the opposite sideas the object

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