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A student determines the focal length of a device X, by focussing the image of a far off object on
the screen positioned as shown in the figure below.
[ ]
X
o
The device X is.
a) Concave lens
b) Concave mirror
c) Convex lens
d) Convex mirror
of a box and emerges out
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Answer:
B hope it is help full to you
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