Two identical glass μg=3/2 equi-convex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water μw=4/3. The focal length of the combination is

1.  f/3             
2. f
3. 4f3               
4. 3f4

Subtopic:  Lenses |
 57%
From NCERT
NEET - 2016
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