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What is the nature of the lens for $F_{1}$ and $F_{2}$ from the figure?

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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

The nature of the lens for

F_{1}

is convex, and

F_{2}

is concave.
For

F_{1}

, the object is at infinity for a convex lens, which forms an image at focus; for

F_{2}

, the object is at infinity for a concave lens, which forms a virtual image at focus. Hence,

F_{1}

is a convex lens, and

F_{2}

is a concave lens.

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