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 the object None of the above You have two converging lenses, each has a focual 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 lens 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)

focal length, f=4cm

object distance, u=20cm

use,

1/u+1/v=1/f

1/20 + 1/v = 1/4

===> v=5cm

image distance, v=5cm

option (E) is correct,

6)

yes,

because focal length(f=4cm) of the first lense is less than the separation between the light

7)

No,

because, the amount o light will get reflect back after incident on the shiny part.

8)

focal length, f=40cm

object distance, u=60cm

use,

1/u + 1/v = 1/f

1/60 + 1/v = 1/(40)

====> v=120 cm

image distance, v=120 cm

option (E) is correct

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