AP EAMCET Engineering 23 Apr 2019 Shift 1 Paper

When an object is moved along the principal axis of a concave mirror placed in air. the image coincides with the object if the object is 50 cm from the minor. If the minor is placed at a depth of 20 cm in a transparent medium, the image coincides with the object when the object is 40 cm from the min or. The refractive index of the liquid is