Q. 205.0( 2 Votes )
A convex lens has
According to the question;
Object distance = u;
Image distance (v) = 20cm;
Focal length = 10cm
By lens formula;
⇒ u = -20cm.
Therefore, object is placed at 20 cm in front of lens.
Height of object h1= 2cm;
Magnification = =
Putting values of v and u
Height of image is 2 cm.
Negative sign means image is inverted.
Thus, the image is real, inverted and same as size of object.
Diagram below shows the image formation.
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