Mammoth Memory

Small critical angle

The smaller the critical angle the higher the refractive index.

Small critical angle `rArr` High refractive index

 

Water to air

Critical angle `~~50^circ`  `n=1.3`

Critical angle of light travelling from water to air.

 

Glass to air

Critical angle `~~42^circ`  `n=1.5`

Critical angle of light travelling from glass to air.

 

Diamond to air

Critical angle `~~24^circ`  `n=2.4`

Critical angle of light travelling from diamond to air.

 

Conclusion

Refractive index and critical angle of water glass and diamond.

NOTE: Low refractive number gives low density and large critical angle

High refractive number gives high density and small critical angle

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