Question

A ray of light strikes a glass slab at an angle of 30 degree. Find the refractive refractive index of glass such that an angle of refraction is 19.5 degree. (take sine 19.5=1/3, sin 30 degree=1/2)

Answer 1

Answer:

refractive index of glass =n2=1.5

Explanation:

Let sin(θ1)=sin30,  sin(θ2)=sin19.5

As n1sin(θ1)=n2sin(θ2)........................n1=1..........................n2=?

sin30=n2 sin19.5

n2=(sin30)/(sin19.5)

n2=1.5.............................................(ANSWER

Answer 2

Answer:

n=1.5

Explanation:

given

sin 30 = 1/2

sin 19.5 = 1/3

we know that

n = sin i / sin r

= sin 30 / sin 19.5

= ( 1/2 ) / ( 1/3 )

= 1/2 × 1/3

= 3/2

= 1.5