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.