The plane wavefront shown in the diagram is travelling from air to water. LM is the incident wavefront and L′M′ is the refracted wavefront. The wavefront LM is obliquely incident on the surface of water at an angle of incidence 60∘. If the distance MM′=10 cm, find distance LL′. Take refractive index of water equal to 43.

The plane wavefront shown in the diagram is travelling from air to wat

1.	The plane wavefront shown in the diagram is travelling from air to water. LM is the incident wavefront and L′M′ is the refracted wavefront. The wavefront LM is obliquely incident on the surface of water at an angle of incidence 60∘. If the distance MM′=10 cm, find distance LL′. Take refractive index of water equal to 43.
Answer» The plane wavefront shown in the diagram is travelling from air to water. $L M$ is the incident wavefront and $L^{'} M^{'}$ is the refracted wavefront. The wavefront $L M$ is obliquely incident on the surface of water at an angle of incidence $60^{\circ}$ . If the distance $M M^{'} = 10 cm$ , find distance $L L^{'}$ . Take refractive index of water equal to $\frac{4}{3}$ .

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