42. A magnifying lens has a focal length of 100 mm. An object whose size is 16 mm is placed at some dista
from the lens so that an image is formed at a distance of 25 cm in front of the lens.
(a) What is the distance between the object and the lens ?
(b) Where should the object be placed if the image is to form at infinity ?
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Explanation:
Calculating magnification with the help of lens formula:
Magnification of a lens is defined as the ratio of the height of image to the height of object. It is also given in terms of image distance and object distance. It is equal to the ratio of image distance to that of object distance.
m=hiho=vu
Where, m= magnification
hi= height of image
ho= height of object
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