{"id":84982,"date":"2025-06-01T02:58:54","date_gmt":"2025-06-01T02:58:54","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=84982"},"modified":"2025-06-01T02:58:54","modified_gmt":"2025-06-01T02:58:54","slug":"in-a-periscope-the-two-plane-mirrors-are-kept","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/in-a-periscope-the-two-plane-mirrors-are-kept\/","title":{"rendered":"In a periscope, the two plane mirrors are kept"},"content":{"rendered":"

In a periscope, the two plane mirrors are kept<\/p>\n

[amp_mcq option1=”parallel to each other” option2=”perpendicular to each other” option3=”at an angle of 60\u00b0 with each other” option4=”at an angle of 45\u00b0 with each other” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2020<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nIn 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.
\n<\/section>\n
\n– A simple periscope uses two plane mirrors.
\n– The mirrors are placed parallel to each other.
\n– Each mirror is tilted at 45 degrees to the axis of the periscope.
\n<\/section>\n
\nMore complex periscopes use prisms instead of mirrors to avoid issues with coatings and ensure total internal reflection, but the principle of directing light through successive reflections remains the same, often with parallel optical elements.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

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\u00b0 with each other” option4=”at an angle of 45\u00b0 with each other” correct=”option1″] This question was previously asked in UPSC CDS-1 – 2020 Download PDFAttempt Online In a simple periscope, two plane mirrors … <\/p>\n

Detailed SolutionIn a periscope, the two plane mirrors are kept<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1087],"tags":[1288,1153,1128],"class_list":["post-84982","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1288","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nIn a periscope, the two plane mirrors are kept<\/title>\n<meta name=\"description\" content=\"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.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/in-a-periscope-the-two-plane-mirrors-are-kept\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In a periscope, the two plane mirrors are kept\" \/>\n<meta property=\"og:description\" content=\"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.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/in-a-periscope-the-two-plane-mirrors-are-kept\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T02:58:54+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"In a periscope, the two plane mirrors are kept","description":"In a simple periscope, two plane mirrors are used to change the direction of light twice. 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