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[" 20.A glass slab has a critical angle ...

[" 20.A glass slab has a critical angle of "30^(@)" when placed in a "],[" What will be the critical angle when it is placed in lawd in "],[" refractive index "6/5?],[[" (a) "45^(@)," (b) "37^(@)],[" (c) "53^(@)," (d) "60^(@)]]

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