Question

find the distance v if object distance is 15 CM and its focal distance is is 10 cm of a convex lens​

Answer 1

Answer:

using lens formula 1/f=1/v-1/u where u =-15 cm ( - sign always use before object distance and f= 10 cm ( for convex focal length always positive) then put the value 1/10= 1/v -(-1/15) then 1/10 -1/15= 1/v ,, 1/v = 1/25 then v = 25 cm