import numpy as np
import matplotlib.pyplot as plt

height = 10
radius = 2
base_radius = 0.5
base_length = 1.0

x_base = np.linspace(0, base_length, 10)
y_base = base_radius*np.ones(x_base.shape[0])

x_lamp = np.linspace(base_length, height, 100)
y_lamp = base_radius + ((x_lamp)/height)*(radius-base_radius)

x = np.append(x_base, x_lamp)
y = np.append(y_base, y_lamp)
plt.plot(x, y)

axes = plt.gca()
axes.set_xlim([0, 1.1*base_length+height])
axes.set_ylim([0,1.1*radius])

plt.show()