When monochromatic red light is used instead of blue light in a convex lens, its focal length
Question
When monochromatic red light is used instead of blue light in a convex lens, its focal length
Solution
The focal length of a lens is determined by its physical properties, such as the shape and the material from which it is made. It is not affected by the color or wavelength of the light passing through it. Therefore, when monochromatic red light is used instead of blue light in a convex lens, its focal length remains the same. However, due to the difference in wavelengths, red light will refract less than blue light, which may cause a slight shift in the focus point, but the focal length of the lens itself does not change.
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