Question

A photographic slide is 35 mm wide and 22 mm high. The projected image is 66 cm high. How wide is the projected image?

Answer 1

Projected image is `105` `cm`.

Explanation:

When a photographic slide is projected, its dimension increase proportionately .e. ratio between width and height remains same.

As height has grown from `22` `mm` to `66` `cm` (or `660` `mm`), the ratio is `22:660` or `1:30`.

Hence `35` of the width of slide, when projected becomes

`35xx30=1050` `mm` or `105` `cm`.