llustration 20 A magnifying lens has a focal length of 10 cm

Last updated: 6/7/2023

llustration 20 A magnifying lens has a focal length of 10 cm a Where should an object be placed if the image is to be 30 cm away from the lens b What will be the magnification Solution a b In case of magnifying lens it is convergent in nature and the image is erect enlarged virtual between infinity and object and on the same side of the lens f 10 cm v 30 cm m and hence from lens formula 1 1 1 we have i e u 7 5 cm 30 u 10 So the object must be placed at a distance of 7 5 cm which is f in front of the lens h V 30 7 5 and 1 1 1 vuf u h 1 4 i e image is erect virtual and four times the ri 30cm U