opaque glass does not allow light to pass through it.
The north vectors add up as so the south vectors. Then subtract the two. For north its 4 + 5 = 9. South is 2 + 5 = 7. Then 9-7 = 2km North (D)
A woman walks in a straight line with the sun to her right at six o'clock in the morning.
The sun rises East of her, so the woman is walking toward the North pole.
A man walks in a straight line with the sun to his right at six o'clock in the evening.
The sun sets West of him, so the man is walking toward the South pole.
The woman and the man are both walking along lines of constant longitude.
Answer:
Explanation:
Given
Wavelength of green light 
For destructive interference by reflection the path difference is an integral multiple of wavelength so
where 
n=refractive index of medium
suppose water is the medium
so
