. A convex lens can form a magnified erect as well as magnified inverted image of an object placed in front of it


Draw  ray  diagram  to  justify  this  statement stating the position of the object  with  respect  to the lens in each case.

An object  of height  4 cm is placed  at a distance of 20 cm from a concave lens of focal length  10 cm. Use lens  formula  to determine the position of the  image  formed.

 

Best Answer

Ans. A  convex  lens  can  form  a  magnified erect image when the object is placed between the optical centre and principal focus of the convex lens (i.e., between  0 and  F').

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A convex lens can form a magnified inverted image when the object is placed between focus and  the centre of curvature (i.e., between  F' and  2F').

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Object height h = 4 cm

Object distance u = -20 cm

Nature of the lens = concave lens

Focal length = f = +10 cm

Image distance v = ?

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The image is formed at a distance of 20 cm from the lens on the opposite side

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