Man wants to get a picture of a zebra

Man wants to get a picture of a zebra. He photographed a white donkey after
fitting a glass, with black stripes on to the lens of his camera. What photo will he get ? Explain.

i) The photographer will not get the photograph of zebra.
ii) Instead of that, he will obtain a photograph of the white donkey with reduces brightness.
iii) This happens because the black stripes on the glass, block the light from the object reducing intensity of the image.