a large no; of thin black strips are painted an a concave mirror ,the image on a distant white horse will be----------options-a] a zebra b]white horse c] black horse d]darker white house e]dimmer white horse.

The correct answer is (e) Dimmer white horse

It is because each point of mirror is illuminated by the light coming from the object evenly and by refraction each point redirects the ray of light coming from object to form a image. If thin black stripes are made on the surface of the mirror then few part of the lens is obscured, that is the focal depth of the mirror will get changed and consequently the image of horse will get less brightness that is dimmer white horse will be observed.  

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b) white horse.

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