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在几何光学中,从点光源或者物点辐射出的光线,经过凸透镜折射形成的实像和亮斑是两个相似而有相异的光学概念,正因为它们相似,所以常常有人把两者混为一谈,尤其是在一些具体的问题中,由于分不清是实像还是亮斑,错把亮斑当实像而用透镜成像公式解题的屡见不鲜。例如1989年高考第33题,1991年高考第33题,1993年高考第27题,都反映了这个问题。
In geometric optics, the light radiated from a point light source or object point, the real image and the bright spot formed by refracting through the convex lens are two similar and different optical concepts. Because of their similarity, people often confuse the two. Especially in some specific problems, because it is not clear whether it is a real image or a bright spot, it is not uncommon to use the lens imaging formula to solve the problem by mistakenly highlighting the real image. For example, the 33rd title of the 1989 college entrance examination, the 33rd title of the 1991 college entrance examination, and the 27th title of the 1993 college entrance examination all reflect this issue.