An object 5 cm long and a pencil 10 cm long are placed in front of a pinhole camera such that their

Question

An object 5 cm long and a pencil 10 cm long are placed in front of a pinhole camera such that their images have the same length. The ratio of the distance of the object from the pinhole to that of the pencil is\

Professor PC Thomas Classes · Answer

For similar triangles $\frac{\mathrm{x}_{1}}{\mathrm{x}_{2}}=\frac{5}{10}$\