Polarisation of light (Question 1 (8 Marks)) — UPSC Physics Optional IFoS 2023 Paper I

A length of 25 cm of a solution containing 50 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 cm of the solution containing 100 gm of solute per litre.