אישי ניתן להתעלם יועץ negative focal length אמברגו אהוב החברה
SOLVED: Which of the following statements are true concerning sign conventions for image formation? Check all that apply. a.A converging lens has a negative focal length; a diverging lens has a positive
Lenses
Focal Length | MEETOPTICS Academy
Why is the power of concave lens negative? - Quora