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`        An object 1 cm high is placed at a distance of 1.5 m from the screen. How far a concave mirror be placed so that it may form a 2cm high image of the object on the screen? Also find the focal length of the mirror.`
6 years ago

510 Points
```										since image is larger than object so its image is virtual ...
let the mirror is placed at u distance far from object & v distance far from screen...     (mirror is bw object & screen)
v/u = 2/1 = 2
v = 2u                   (given)
v + u = 1.5
u = 1.5/3 = -50cm
v = 100
focal length = f
applying lens formula
1/v + 1/u =1/f
-1/50 + 1/100 = 1/f
f = -100cm
thus mirror should be placed at a distance 100cm from screen...
approve my ans if u like it
```
6 years ago
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