A concave mirror of focal length 20. A concave mirror of radius R is kept on a horizontal table (figure 18-E2). Water (refractive index = μ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself?

above the water surface

Let the object placed at a height x above the surface of


If the image has to be formed at the same position, then the apparent position of the object with respect to mirror should be at the center of curvature. Since, we know that