In a periscope, the two plane mirrors are kept
[amp_mcq option1=”parallel to each other” option2=”perpendicular to each other” option3=”at an angle of 60° with each other” option4=”at an angle of 45° with each other” correct=”option1″]
This question was previously asked in
UPSC CDS-1 – 2020
In a simple periscope, two plane mirrors are used to change the direction of light twice. To achieve this, the mirrors are placed parallel to each other. Each mirror is typically oriented at a 45-degree angle relative to the line of sight (or the tube of the periscope) to reflect light at a 90-degree angle. The parallelism of the two mirrors ensures that the final image observed is upright relative to the object.
– A simple periscope uses two plane mirrors.
– The mirrors are placed parallel to each other.
– Each mirror is tilted at 45 degrees to the axis of the periscope.