A thin double convex lens has a refractive power P and identical radii of curvature R for both of its surfaces. A plano-convex lens is fabricated using the same material but has a power of 1.5 P. The radius of curvature of the curved surface of this plano-convex lens is:

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?

Which of the following viceroys of India is associated with the 'Ilbert Bill' controversy?