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Extraction of Iron

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how to find out critical angl

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Q. How can you find critical angle of water? Explain your steps briefly.

Q. How is critical angle related to the refractive index of the medium?

Q. The critical angle for refraction from glass to air is

42^{\circ}

and that from water to air is

48^{\circ}

. Find the critical angle for refraction from glass to water.

Q. Critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the angle of refraction is 90°.
If a ray of light travels from water

(μ_{w})

(μ_{a})

. Find the critical angle?

Q. What is the equation for finding the critical angle?

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