http://i.imgur.com/78k6OkP.jpg An object is 20cm from a 4cm focal length converg

Question

http://i.imgur.com/78k6OkP.jpg 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

here,
Ques 5.
object distance, do = 20 cm
focal length, f = 4 cm
From thin lens equation, image distance, di
1/di = 1/f - 1/do
1/di = 1/4 -1/20
di = 5 cm to right of lens
option E is correct

Ques 6:
yes since radius of curvature is same for them

Ques 7:
no, there will be phase reversal at thin film coating of silver.

Ques 8:
object distance, do = 60 cm
focal length, f = 40 cm
From thin lens equation, image distance, di
1/di = 1/f - 1/do
1/di = 1/40 -1/60
di = 120 cm to right of lens

Since magnification, m = -di/do = - 120 /60 = -2

The image will be twice as large as original and will be inverted,

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