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A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is ______.
A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Figure). When observed from the face AD, the pin shall ______.
- appear to be near A.
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- Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface.
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Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the ______.
