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Suppose that the lower half of the conca...

Suppose that the lower half of the concave mirror's reflecting surface is covered with an opaque (non-reflective ) material. What effect will the have on the image of an object placed in front of the mirror ?

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Don.t think the image is only half of the object. Rays from different points of object, objeyed by laws of reflection, are reflected and the image of whole object is produced, the rear end BC being perpendicular to principal axis, image is formed at the same plane and is almost of same size. the rays from off axis points after reflection produce distorted image by aperture effect.
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