Combination of concave and convex lens placed in contact when this pair will behave convergent and when will divergent ??
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If two thin lenses are in close contact then,
1/f = 1/f1 + 1/f2 , or,
Power: P1 + P2 = P.
The combination will work as a convex lens if the power of convex lens is more (numerically in Diopters) than the power of concave lens. So it's convergent.
If concave lens has more power then the result will be concave. So it's divergent.
1/f = 1/f1 + 1/f2 , or,
Power: P1 + P2 = P.
The combination will work as a convex lens if the power of convex lens is more (numerically in Diopters) than the power of concave lens. So it's convergent.
If concave lens has more power then the result will be concave. So it's divergent.
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