yes - a rhombus is a special kind of convex quadrangle which has four equal sides.
projector have concave or convex
It is convex if you look at it from the inside but it is not any kind of polygon.
If you're talking about mirrors then convex is the mirrors that makes things appear larger. Hope this helps!
convex
A regular polygon is a special kind of convex polygon - one in which all the sides are of the same length and all the angles are equal. Convex and concave polygons form disjoint sets: so no concave polygon can be regular.
CONVEX
A convex mirror will produce an upright, virtual, and diminished image of objects placed in front of it. The image will appear smaller than the actual object, making it useful for security purposes and in vehicles to provide a wider field of view.
Convex lenses
A convex lens.
Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.
convex