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. Whi

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Q: 77 (NDA-II/2009)
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?
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question_subject: 

Maths

question_exam: 

NDA-II

stats: 

0,2,9,2,2,3,4

keywords: 

{'focal length': [1, 0, 5, 7], 'anvex lens': [0, 0, 1, 0], 'lens': [0, 0, 0, 1], 'ln object': [0, 0, 1, 0], 'virtual image': [0, 0, 1, 1], 'distance': [0, 3, 3, 3], 'real image': [0, 0, 0, 1], 'object': [1, 0, 11, 43], 'principal axis': [0, 0, 1, 1], 'cm': [2, 0, 7, 20], 'certain size': [0, 0, 1, 0]}