Jee Main
Geometrical Optics
JEE Main 2025 (Online) 24th January Evening Shift
MCQ+4 / -12025
A photograph of a landscape is captured by a drone camera at a height of 18 km . The size of the camera film is $2 \mathrm{~cm} \times 2 \mathrm{~cm}$ and the area of the landscape photographed is $400 \mathrm{~km}^2$. The focal length of the lens in the drone camera is :