Question

Object is 1cm high and placed in a distance 20cm from the optic center of a convex lens if the focal length is 10cm find its height

Answer 1

Answer:

lens formula . 1/f=1/v-1/u here u is -20cm and f is 10cm then 1/10=1/v-(-1/20), 1/10-1/20=1/v ,1/v=2-1/20 ,1/v=1/20 then v is 20 cm and magnification formula =v/u=Hi/Ho we use this formula v/u=Hi/Ho , 20/-20=Hi/1 ,,, Hi is -1 cm here (-) means image is real and inverted