Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 4. Light Refraction
Image Formation By Lens
Image Formation By Lens Introduction : From lens formula, we find that for a lens of a fixed focal length as object distance u changes, image distance ---- also changes. Moreover, as u decreases or increases, this changes the position, the nature and the size of the image. Different cases, are as given below with their ray diagrams. CONVEX L ENS IN DIFFERENT CASES Case 1 : Object at Infinity Case 2 : Object at distance more than twice the Focal Length Case 3. Object at distance twice the Focal Lengths Case 4 : Object at distance more than Focal Length and less than twice is Focal Length Case 5 : Object at Focus Case 6 : Object between Focus and Optical Centre CONCAVE LENS IN DIFFERENT CASES Case 1 : Object at infinity Case 2 : Object at a Finite Distance