InterviewSolution
Saved Bookmarks
| 1. |
The focal length of a concave mirror is 30 cm. If the object is at 20 cm. Determine the position andnature of object. |
|
Answer» Given, u=30 cm f=20 cm v=? Here, 1/u + 1/v = 1/f 1/30 + 1/v = 1/20 1/v = 1/20 - 1/30 1/v = 1/60 v= 60 cm ( u, v, f are always in ‘+’ in concave. But ‘-’ in convex) Now, (Since image is formed on the same side of the object , the image is real) v-u = 60 - 30 = 30 cm So the distance between object and image is 30 cm. |
|