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=P_{1}+P_{2}+P_{3}

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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