Question

Find the refractive index of glass which is a symmetrical convergent lens if it's focal length is double of the radius of curvature of its surface

Answer 1

Answer:

Answer:3/2

Step-by-step explanation:

Convex lens focal length=R

Symmetrical lens=Hence=R1=R2=R

By sigh conventions convex lens: R1=+R

R2= -R

Lens makers formula :

1/f=(n-1)[1/R1-1/R2]

1/R=(n-1)[1/R+1/R]

1/R=(n-1)[2/R]

1=2n-2

2n=3

n=3/2 =1.5

Answer 2

Answer is

n=3/2

=1.5

therefore n=1.5