Q: 77 (NDA-II/2009)

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Ln object is placed at a distance of 12 cm from a anvex lens on its principal axis and a virtual image f certain size is formed. If the object is moved further cm away from the lens, a real image of the same ize as that of the virtual image is formed. Which ne of the following is the focal length of the lens?
question_subject: 
Maths
question_year: 
2009
question_exam: 
NDA-II
stats: 
0,104,64,56,104,0,8