Polarisation of light (Question 2 (8 Marks)) — UPSC Physics Optional IFoS 2023 Paper I

A length of 25\text{ cm} of a solution containing 50\text{ gm} of solute per litre causes a rotation of the plane of polarization of light by 5^\circ. Find the rotation of the plane of polarization by a length of 75\text{ cm} of the solution containing 100\text{ gm} of solute per litre.