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下列有关光现象的说法中正确的是（　　） A．电影院银幕上的图案是放映机生成的正立、放大的实像 B．经过凹透镜折射后的两条光不可能相交 C．太阳光经过三棱镜...

Mar 19, 2024

下列有关光现象的说法中正确的是（　　） A．电影院银幕上的图案是放映机生成的正立、放大的实像 B．经过凹透镜折射后的两条光不可能相交 C．太阳光经过三棱镜形成彩色光，彩色光再经凸透镜会聚后又可形成白光 D．小孔成像时物体离孔越近所成的像越大

Solution

Analyze option A: The image on a movie screen is not a real image produced by the projector, but rather a projection of light. Real images can be projected onto screens, but in the context of a movie theater, the image is not formed by the projector lens alone; it is a complex process involving digital or film projection

Analyze option B: Diverging lenses, or concave lenses, spread out light rays. However, it is theoretically possible for rays to intersect after passing through a concave lens if they are redirected by additional optical elements. Therefore, this statement is not absolutely correct

Analyze option C: White light can be dispersed into its constituent colors by a prism due to refraction and the different wavelengths of light bending by different amounts. If these colors are then passed through a converging lens, they can be recombined to form white light again. This statement is correct

Analyze option D: In pinhole camera model, the size of the image is inversely proportional to the distance from the pinhole; as the object gets closer to the pinhole, the image gets larger. This statement is correct

Key Concept

Dispersion and Recombination of Light: White light can be dispersed into a spectrum of colors by a prism due to the phenomenon of refraction, where light of different wavelengths bends by different amounts. A converging lens can then recombine these colors to form white light again.

Explanation

Option C is correct because it accurately describes the dispersion of white light by a prism and the recombination of the spectrum of colors into white light by a convex lens.