how to find the focal length without any calculations
Answers
Answered by
1
U mean to say for practical or Numericals
leelavathy:
eg:object distance is -100 and image distance is +25 in case of convex lens then what is the focal length
for mirror or lens
by using formula 1÷f=1÷v- 1÷u
formula varries for lens and mirror
where v is image distance and u is object distance soo.
Answered by
2
focal length is always in negative in case of concave and it is positive in case of convex
Similar questions