Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length

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Q: 80 (NDA-I/2012)
Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length

question_subject: 

Maths

question_exam: 

NDA-I

stats: 

0,2,7,2,3,3,1

keywords: 

{'focal lengths': [0, 0, 0, 1], 'focal length': [1, 0, 5, 7], 'thin convex lenses': [0, 0, 0, 1], 'distance': [0, 3, 3, 3], 'cm': [2, 0, 7, 20]}