A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X). (a) This device is a concave lens of focal length 8 cm. (b) This device is a convex mirror of focal length 8 cm. (c) This device is a convex lens of focal length 4 cm. (d) This device is a convex lens of focal length 8 cm.

A student used a device (X) to obtain/focus the image of a well illumi

1.	A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X). (a) This device is a concave lens of focal length 8 cm. (b) This device is a convex mirror of focal length 8 cm. (c) This device is a convex lens of focal length 4 cm. (d) This device is a convex lens of focal length 8 cm.
Answer» A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X). (a) This device is a concave lens of focal length 8 cm. (b) This device is a convex mirror of focal length 8 cm. (c) This device is a convex lens of focal length 4 cm. (d) This device is a convex lens of focal length 8 cm.