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```        A concave mirror produces magnification of 1/2 when an object is placed at a distance  of 50 cm from it. Where should the object be placed so that the virtul image of double the size is formed by the mirror?
Ans: 10cm.```
6 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,

All the best.
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Sagar Singh
B.Tech, IIT Delhi

```
6 years ago
510 Points
```										magnification = v/u = 1/2 = -(h1/h)
v/-50 = 1/2
v =-25cm
1/v + 1/u = 1/f
-1/25 + -1/50 = 1/f
f = -50/3       (focal length)
let it is placed at u distance from mirror then
v/u = h1/h = 2             (given)
v = 2u
applying mirror formula
1/v + 1/u = 1/f
1/2u + 1/u = 1/f
3/2u = 1/f
u = 3f/2
u = -25cm
thus object should be placed at 25cm from mirror

```
6 years ago
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