Question

Two identical thin plane-convex lenses of refractive index n are silvdered one on the plane side and the other on the convex side.The ratio of their focal legths is

• A. n / (n-1)
• B. (n-1) / n
• C. (n+1) / n
• D. n

Answer 1

Answer: (A)

n / (n-1)

Answer is $\frac{n}{n-1}$..where n is. refractive index