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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > The image of an object kept at a distance of 30 cm in front of a concave mirror is found to coincide with itself. If a glass slab ( mu = 1.5) of thickness 3 cm is introduced between the mirror and the object, then

The image of an object kept at a distance of 30 cm in front of a concave mirror is found to coincide with itself. If a glass slab ( mu = 1.5) of thickness 3 cm is introduced between the mirror and the object, then

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