a camera has a lens(or combination of lenses) like theconverging lens that focus

Question

a camera has a lens(or combination of lenses) like theconverging lens that focuses light from objects into real images ona piece of film. an enlarger shines light through a negative, anduses a lens to project a real image of the picture on the negativeonto the platform where the photographic paper is placed. explainhow each of the following will affect your photographs. a) the negative is placed in the enlarger with half of itcovered by a piece of tape on the inside. b) half of the lens on the enlarger is covered by a piece ofpaper. c) the camera lens is replaced by a diverging lens with thesame focal length. a) the negative is placed in the enlarger with half of itcovered by a piece of tape on the inside. b) half of the lens on the enlarger is covered by a piece ofpaper. c) the camera lens is replaced by a diverging lens with thesame focal length.

Explanation / Answer

   a.   If half of the film(negative) is covered, only the exposed part will be printed ontothe photographic paper.    b.   If the half part of lensin enlarger is covered, entire photo will still be developed butthe intensity of photo will be reduced as the intensity depends onnumber of light rays passing throught the lens which will bereduced to half.    c.   If diverging lens isused in place of convergent lens, no image shall be obtained onngative as the divergent lens makes virtual images that can not beobtained on screen ( film here).

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