A. 4 × 10-7m - 8 × 10-7m
A.
B. 4 × 10-6m - 8 × 10-8m
B.
C. 4 × 105m - 8 × 10-9m
C.
D. None of the above
D.
Correct Answer: A
সঠিক উত্তর: A
Explanation
ব্যাখ্যা
The wavelength of visible light ranges from 400 nm to 700 nm.
From option we can say that visible light ranges from 4 × 10-7m - 8 × 10-7m.