Question - A student focussed the image of a distant object using a device 'X' on a white screen 'S' as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.
A. The device X is a convex lens of focal length 20 cm.
B. The device X is a concave mirror of focal length 40 cm.
C. The device X is a convex mirror of radius of curvature 40 cm.
D. The device X is a convex lens of focal length 40 cm.
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