A glass prism of refractive index 1.5 an...

A glass prism of refractive index 1.5 and angle of prism `6^(@)` is put in contact with another prism of refractive index 1.6 when a ray of light is made incident on this combination normally then it emerges out undeviated. The angle of second prism will be

`6^(@)`

`5^(@)`

`4^(@)`

`3^(@)`

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