A double convex lens has two surfaces of equal radii R and refractive index n= 1.5 find its focal length
Answers
Answered by
7
Answer:
Answer is f = R
Step-by-step explanation:
Given, n = 1.5
R1 = R2 = R
Now,
1/f = (n-1) (1/R1 - 1/R2)
1/f = 1.5 -1 (2/R)
1/f = 5/10 × 2/R
1/f = 10/10R
1/f = 1/R
f = R
Hope it helps...
Similar questions