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The photograph of a house occupies an area of 1.75 cm2on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55 m2. What is the linear magnification of the projector-screen arrangement?

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Area of the house on the slide = 1.75 cm2 

Area of the image of the house formed on the screen = 1.55 m2 

= 1.55 × 104 cm2

Arial magnification, ma = (Area of image/Area of object) = (1.55/1.75) x 104 

Linear magnifications, ml = √ma = √(1.55/1.75) x 104 = 94.11

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