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F_{1} :

Convex,

F_{2}

: Concave

F_{1}

: Convex,

F_{2}

: Convex

F_{1}

: Concave,

F_{2}

: Concave

F_{1}

: Concave,

F_{2}

: Convex

answer is A.

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Detailed Solution

F_{1}

lens is a convex lens, and

F_{2}

is a concave lens.
A convex lens is also called a converging lens because it converges the light rays refracting through it. In the figure of lens

F_{1}

, it can be seen that the light ray incident on the lens is converging. Hence, the lens

F_{1}

is a convex lens.
On the other hand, A convex lens is diverging in nature because it diverges the light rays refracting through it. In the figure of lens

F_{2}

, it can be seen that the light ray incident on the lens is diverging. Hence, lens

F_{2}

is a concave lens.

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