Sun April 24, 2011 By: Hemapriya Jagadeesan

pl. answer

Expert Reply
Sun April 24, 2011
In VIBGYOR, the wavelength decreases from red to violet whereas the frequency increases from red to violet. Therefore, The frequency of monochromatic red light is slower than the monochromatic blue light in the denser medium of the convex glass and will bend further as the emerging ray and the focal length will change.

Blue light travels slower in glass then red and so has a higher index of refraction. That results in a shorter focal length.

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