Q. 174.5( 6 Votes )

An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

Answer :

Given,

Object distance u = -15 cm


Focal length of convex lens f= 20 cm


Image distance v=?


We know that lens formula is:



Substituting the values in this formula







v = -60 cm





i.e.


Height of image = 4×height of object


● Image is formed on the same side of the object above the principal axis.


● It is virtual and erect.


● It is enlarged or magnified i.e. 4 times to the size of object.

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