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2 A student determines the focal length of a device X, by focussing the image of a far off object onthe screen positioned as shown in the figure below.[ ]XoThe device X is.a) Concave lensb) Concave mirrorc) Convex lensd) Convex mirrorof a box and emerges out​

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ong>Answer:

B HOPE it is help full to you



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