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Solution


Q.

If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be             [2024]
1 10/3 cm  
2 -20 cm  
3 -10 cm  
4 15 cm  

Ans.

(3)

Magnification, m=2=-vu

2=-(15-u)-u

2u=15-u

3u=15⇒u=5 cm

1f=1v+1u=110+1-5=1-210=-110

f=-10 cm