InterviewSolution
Saved Bookmarks
| 1. |
6 The image of an object is at 10 cm in a concave lens. If the focal length of concave lens is 15 cm.Determine the object distance from lens. and mature of 9mage |
|
Answer» focal length, f = -15 cm Distance of image, v = -10 cm Distance of object, u =? We know that, 1/v - 1/u = 1/f 1/-10 - 1/u = 1/-15 -1/10 + 1/15 = 1/u (-3 + 2)/30 = 1/u -1/30 = 1/u Therefore u = -30 cm Thus object is placed 30 cm away from the concave lens. Negative sign shows that object is at 30cm in front of the lens. |
|