(i) The two positions are:
When an object is placed between the pole(p) and focus (f’) of a concave mirror, the image formed is larger than the object(or magnified). When an object is placed between the focus (f) and centre of curvature (c) of a concave mirror, the image formed is larger than the object.
Difference between the two images:
| 1. In case (i), the image is formed behind the mirror |
In case (ii), the image is formed beyond the centre of curvature. |
| 2. In case (i), the image formed is virtual and erect |
In case (ii), the image formed is real and inverted. |
(ii) Here, P = + 15 D
f =?
From f = 1/P, f = 100/1.5 = 66.7cm
As power is positive, the prescribed lens is converging or convex lens.
