why is the periscope set at 45 degree angle?
plz answer it fast......
Answers
Answered by
18
This is because we basically want the direction light to be changed by 90 degrees.
To achieve this, we need to keep the mirror at an angle of 45 degrees.
To achieve this, we need to keep the mirror at an angle of 45 degrees.
Namita:
do u mean ray of incidence?
ya the angle between the ray of incidence and the range of emergence should be 90 degrees
u mean 180 degrees
thanks a lot
nope 90 degrees
total 45+45= 90[90+90]=180
not actually.. the first mirror and the second mirror will be in opposite direction. So it will be 90-90=0. so if there is no net deflection!!
Answered by
15
when you aim a light sourse to a mirror, it gets reflected in the following way:
the angle of incidence respect to the perpendicular of the mirror's surface (if the mirror was the upper part of the letter T, the perpendicular would be the vertical stick, since it cuts it with an 90 degree angle) is equal to the angle of reflection. so if you aim it at 45 degrees, it would get reflected 45 degrees the other way, adding to a total of 90 degrees (which would make the light go up. (or a vertical light source become horizontal, so a submarine operator can see the surface).
in a periscope, they also add another mirror so that the light coming from the surface gets reflected, goes downwards, and then turns horizontal for a crew member to see.!!!
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