Answer :
As per the given question three lenses having power 2, 2.5 and 1.7 D are kept touching in a row.
So resultant power will be
P=P1+P2+P3
P= 2+2.5+1.7
P= 6.2D
The resultant combination 6.2D is of convex lens and it will produce a converging effect.
Lens Formula, Magnification and Sign Convention
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