4. Two thin converging lenses of focal lengths 20 cm and 40 cm are placed coaxially 20 cm apart. An object is located at a distance of 48 cm from the first lens. Find, (i) the position of the image (ii) the positions of the principal points and (iii) the positions of the focal points.
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4. Two thin converging lenses of focal lengths 20 cm and 40 cm are placed coaxially 20 cm apart. An object is located at a distance of 48 cm from the first lens. Find, (i) the position of the image (ii) the positions of the principal points and (iii) the positions of the focal points.
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