ABC is a right angled glass prism of refractive index, 1.5 /_A, /_B and /_C are 60^(@), 30^(@) and 90^(@) respectively. A think layer of liquid is on the AB. For a ray of light is incident normally on AC to be totally reflected at AB, the refractive index of the liquid on AB should be

ABC is a right angled glass prism of refractive index, 1.5 /_A, /_B an

1.	ABC is a right angled glass prism of refractive index, 1.5 /_A, /_B and /_C are 60^(@), 30^(@) and 90^(@) respectively. A think layer of liquid is on the AB. For a ray of light is incident normally on AC to be totally reflected at AB, the refractive index of the liquid on AB should be
Answer» 1.5 1.4 1.3 1.2 Answer :C

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ABC is a right angled glass prism of refractive index, 1.5 /_A, /_B and /_C are 60^(@), 30^(@) and 90^(@) respectively. A think layer of liquid is on the AB. For a ray of light is incident normally on AC to be totally reflected at AB, the refractive index of the liquid on AB should be

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