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```        i need the solution
an object placed in front of concave spherical mirror produces a 3-fold magnified to real image .on moving the object 20cm towards the mirror a similarly magnified virtual image is formed. find the focal length of the mirror```
7 years ago

Chetan Mandayam Nayakar
312 Points
```										1/u  + 1/v  =1/f, u/v =3, therefore u=4f. 1/(4f-20) +1/V = 1/f.  (4f-20)/V = -3. therefore V= (20-4f)/3
1/(4f-20) - 3/(4f-20) = 1/f, therefore, f = 10/3 = 3.33cm
```
7 years ago
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