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ICSE Class 10 Answered

Draw a ray diagram showing  how a laterally inverted image of an object is produced by a right angled isosceles prism . In which special device do we find this application?
Asked by cbiswajit | 23 Sep, 2019, 08:14: PM
answered-by-expert Expert Answer
Lateral Image inversion using right angled isoceless prism is used in binoculars as shown below
Binoculars are simply two telescopes side by side, one for each eye.
But there's a difficulty of using convex lens as the objective lens.
When light rays from a distant object pass through a convex lens, they cross over.
That's why distant things sometimes look upside down if you look at them through a magnifying glass.
So binoculars have a pair of prisms inside them to rotate the image through 180 degrees.
One prism rotates the image through 90 degrees (flips it onto its side),
then the next prism rotates it through another 90 degrees (flips it onto its side again),
so the two prisms effectively turn it upside down.
Answered by Thiyagarajan K | 23 Sep, 2019, 11:39: PM

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