A monochromatic light is travelling in a medium of refractive index n = 1.6. It enters a stack of glass layers
from the bottom side at an angle θ = 30०. The interfaces of the glass layers are parallel to each other. The
refractive indices of different glass layers are monotonically decreasing as nₘ = n - mㅿn, where nₘ is the refractive index of the mth slab and ㅿn = 0.1 (see the figure). The ray is refracted out parallel to the
interface between the (m -1)th and mth slabs from the right side of the stack. What is the value of m?
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