Question

A rod of length $2 \,cm$ makes an angle $\frac{2 \pi}{3}$ rad with the principal axis of a thin convex lens The lens has a focal length of $10\, cm$ and is placed at a distance of $\frac{40}{3} cm$ from the object as shown in the figure The height of the image is $\frac{30 \sqrt{3}}{13} cm$ and the angle made by it with respect to the principal axis is $\alpha rad$ The value of $\alpha$ is $\frac{\pi}{n} rad$, where $n$ is ___

Answer 1

Answer: 6