Ncert Exercises & Solutions

The photograph of a house occupies an area of \(1.75~\text{cm}^2\) on a \(35~\text{mm}\)35 mm slide. The slide is projected onto a screen, and the area of the house on the screen is \(1.55~\text{m}^2.\) What is the linear magnification of the projector-screen arrangement?
1. \(84.1\)
2. \(94.1\)
3. \(74.1\)
4. \(14.1\)

Areal magnification = \frac{Size of imae}{Size of object}

= \frac{1.55 m^{2}}{1.75 \times 10^{- 4} m^{2}} = 8857.1

And, linear magnification = \sqrt{Areal magnification}

= \sqrt{8857.1} = 94.1

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