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a 9 cm high image of an object is formed on a screen by a convex lens. when the lens is displaced towards the screen, again 4 cm high image is formed on the screen. the height od the image is a-6 cm b-6.5 c-6.25 d-none of these

Physics
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ans- C
could u explain how ?

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Other answers:

isthe ans right?
idk i need to know the answer and explanation for it
well i knw only the trick for explaination @ujjwal
you have two different size of images for two different conditions.. the focal length and all other things are unknown.. And you are asking the size of image again (for the 3rd condition, i guess.. and it too comes with no information).. Sorry, can't help you with this!
yes, i agree - lack of data.

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