JAMB - Physics (2024 - No. 76)
The power of a convex lens of focal length 20cm is
0.05D
0.50D
5.00D
50.00D
คำอธิบาย
The Power is given by: P = \(\frac{1}{f}\)
f = 20cm → 0.2m
P = \(\frac{1}{0.2}\) = 5 dioptres
The Power is given by: P = \(\frac{1}{f}\)
f = 20cm → 0.2m
P = \(\frac{1}{0.2}\) = 5 dioptres