Sagar and Riya were given one mirror each by their teacher. Sagar found his image to be erect and of the same size, whereas Riya found her image erect and smaller in size. This means that the mirrors of Sagar and Riya are,_______ respectively.

A plane mirror is a mirror with a flat reflective surface. It forms virtual, erect, and same-size images.

A convex mirror is a mirror in which the reflective surface bulges toward the light source.  A convex mirror reflects the light outwards and is, therefore, a diverging mirror. It forms virtual, erect, and diminished images.