### Calculate the position of image

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Q. The rms electric field of an electromagnetic wave increases from 286 to 858 N/C.Determine the wave intensities for the two values of the electric field.

Q. An object is 9 cm high and is located p = 29.2 cm in front of a thin diverging lens of focal length f = -18 cm. Calculate the position (distance from the center of the lens) and the height of its image.

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