In a kaleidoscope (two plane mirrors inclined at an angle ( \theta )):

\(\text{Number of images of one object} = \frac{360^\circ}{\theta} - 1\)

Given: \(\theta = 30^\circ\)

\(\frac{360}{30}\) = 12

So, images formed by one object: 12 - 1 = 11

For 10 objects (tinsels):
10 x 11 = 110 images formed.