In the VIBGYOR spectrum (visible light spectrum), the wavelength indeed increases from violet to red, which is true. Violet light has the shortest wavelength, while red light has the longest wavelength.
However, the refractive index generally decreases with increasing wavelength in most media. This means that the refractive index is higher for violet light and lower for red light.
The correct option is (A): Only (a) is true
Obtain the expression for capacity of a parallel plate capacitor. How will the capacity of the capacitor be increased?
Electric charges are uniformly distributed in a small volume. The flux of electric field through a spherical surface of radius 2 cm surrounding the total charge is 10 V x m. The flux over a sphere of radius 4 cm will be:
State and explain Gauss's law in electrostatics. Using it, find the electric field due to a uniformly charged thin spherical shell (charge = q and radius = R) at
(A) external point of shell
(B) internal point of shell
(C) on the surface of shell.