Physics
JAMB 1989
Light of wavelength 5000 x 10
-8cm travels in free space with a velocity of 3 x 10
8ms
-1. What is its wavelength in glass of refractive index 1.5?
-
A.
3333 x 10-8cm
-
B.
5000 x 10-8cm
-
C.
6666 x10-8cm
-
D.
750010-8cm
Correct Answer: Option A
Explanation
n = \(\frac{\text{wavelength in space}}{\text{wavelength in glass}}\)
1.5 = \(\frac{5000 \times 10^{-8}}{\lambda g}\)
\(\lambda\)g = 3333 x 10-8cm
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