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3. An object is imaged on to a photographic sensor using a thin positive lens. The distance between the object and its image is 18 cm, such that the image size is half the size of the object.
(b)A glass plate having plane parallel faces, is 0.5 cm thick and has a refractive index of 1.5. This is inserted between the lens and the photographic sensor, such that the distance between the 1st planar surface and the thin lens is 1.5 cm. Determine the new position of the image. Hint: Consider the glass plate as a thick lens with surfaces having the appropriate radii of curvature)
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