The distance between an object and the s...

The distance between an object and the screen is 100cm. A lens produces an image on the screen when the lens is placed at either of the positions 40cm apart. The power of the lens is nearly

`~~ 3` dioptres

`~~ 5` dioptres

`~~ 7` dioptres

`~~ 9` dioptres

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The distance between an object and a screen is 100 cm. A lens can produce real image of the object on the screen for two different position between the screen and the object. The distance between these two positions is 40 cm. If the power of the lens is close to ((N)/(100))D where N is integer, the value of N is ___________.

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