Correct the following sentences changing the underlined portion, if required:
The phase difference any two points on a wave front is `90^@`.

Correct the following statements if required changing the underlined portion. Like currents repel.

Correct the following statements if required changing the underlined portion. Unlike currents attract.

Correct the following statements if required changing the unerlined portion. Conduction precedes attraction.

Correct the following sentences, if required changing the underlined portion. The refractive index of different colours of light varies directly with their wavelength.

Correct the following statements if required changing the underlined portion. There is a not requires to charge a capacitor.

Correct the following sentences, if required changing the underlined portion. Red light is deviated more than violet light as white light disperses due to refraction throguh a prism.

Correct the following sentences, if required changing the underlined portion. The refractive index of a medium depends on the angle of the minimum deviation.