Question

define angle of minimum deviation for aprism of angle A=60°,the angle of minimum deviation is 30°.calculate it's refractive index of the material of the prisms​

Answer 1

Explanation:

Minimum deviation δ=2i−A

where A is prism angle A=60o

So δ=40o

we know

δ=2i−A

40=2i−60

i=50o

For minimum angle the angle of refraction should be half of prism angle.

So r=A/2=30o

now using the snell's law

nairsini=nglasssinr

sin50=nglasssin30

nglass=1.53 ,