Question

the magnification of convex lens is +2.If a chalk piece of height 5cm is kept in front of the lens ,what is the height of the image.

Answer 1

Given info : the magnification of convex lens is +2. a chalk piece of height 5cm is kept in front of the lens.

To find : The height of image is ...

solution : magnification of lens = height of image/height of object

here magnification of convex lens = +2

Height of chalk piece (object) = 5 cm

so, +2 = height of image of chalk piece/5 cm

⇒+10 cm = height of image of chalk piece

Therefore height of the image formed by convex lens is 10cm.

[ note : magnification of convex lens is positive only when object is placed between focus and optical centre of lens]

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