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A 4.0 cm tall object is placed perpendicular ( e.at 90) to the principal axis of a convex lens of food length 10 cm . The distance of the object from the lens is 15cm. Find the math, position and size of the image.Also find its magnification.
Asked by Jethanleapon | 03 Oct, 2021, 07:35: PM
answered-by-expert Expert Answer
We have lens equation :-   ( 1 / v ) - ( 1 / u )  =  ( 1 / f )
 
where v = lens-to-image distance is to be determined
 
u = -15 cm, lens-to-object distance ( Cartesian sign convention is followed )
 
f = 10 cm , focal length of convex lens
 
(1/v) = (1/10 - (1/15) = 1/30  or    v = 30 cm
 
magnification m = v/u = 30 / ( -15 ) = - 2
 
We get inverted , magnified real image at a distance 30 cm from convex lens at other side of object .
 
Magnification of image is 2 , i.e. image size is twice of object size , i.e. 8 cm
Answered by Thiyagarajan K | 03 Oct, 2021, 07:49: PM

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