1. In figure below, a real inverted image I of an object O is formed by a certai
ID: 2181505 • Letter: 1
Question
1. In figure below, a real inverted image I of an object O is formed by a certain lens: the object image separation is formed by a certain lens: the object image separation is 40.0cm, measured along the central axis of the lens. The image is just half the object. How far from the object. must the lens be placed? What is the focal length?
2. A transparent photographic slide is placed in front of a converging lens with a focal length 0f 2.44cm An image of the of the slide is formed 12.9cm from the slide. how far is the the lens from the slide if the image is (a)real? (b)virtual. Sketch Using ray giagrm
Explanation / Answer
According to thin lens equation, 1/do + 1/di = 1/f Where do (di) is the distance of the object (image) to the lens and f is the focal length. The magnification (M) is equal to di/do. Now, M=di/do=0.5, di+do=40 di=40/3, do=80/3, f=80/9 Since all values for di and do are positive, the lens is convex lens.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.