AB and CD are surfaces ot two slabs as s...

AB and CD are surfaces ot two slabs as shown in Figure . The medium between the slabs has refractive indes 2. Refractive indes of the slab above Ab is `sqrt(2)` and below CD is `sqrt(3)` . Find the minimum angle of incidence at Q, so that the ray is totally reflected by both the slabs.

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