A student used a device "X" to obtain the image of a well illuminated distant building on a screen "S" as shown in the diagram. Select the correct statement about the device "X".
A) The device "X" is a convex lens of focal length 10cm.
B) The device "X" is a convex mirror of focal length 10 cm.
C) The device "X" is a concave mirror of focal length 10 cm.
D) The device "X" is a convex mirror of radius of curvature 10 cm.
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The device X is a concave mirror of focal length 10 cm
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