Why the variation in length of day band night goes on increasing towards the poles?

The variation in the length of day and night increases towards the poles due to the tilt of the Earth's axis and its spherical shape. Near the equator, day and night durations remain relatively consistent throughout the year. However, as one moves toward the poles, the angle of sunlight changes dramatically, leading to extreme variations—such as continuous daylight in summer and prolonged darkness in winter. This phenomenon is a direct result of the Earth's axial tilt and its orbit around the Sun.