Which colour travels fastest in a glass prism?
ABlue
BGrey
CPink
DRed
Answer & Solution
Correct answer: D. Red
1. The bending of red is least while that of violet is most.
2. Equivalently, red light travels faster than violet light in a glass prism.
3. So the correct answer is red.
_Source: NCERT Class 12 Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_
Related questions
Dispersion happens because the refractive index differs with:Violet light has a wavelength of about:In the visible spectrum, red light lies at the:A lens of power minus 4.0 D is a concave lens of focal length:A prescribed lens of power plus 2.5 D is a convex lens of focal length:The power of a converging lens is:A lens of focal length one metre has a power of:The SI unit for the power of a lens is the: