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ICSE Class 9 Answered

Two plane mirrors are placed making an angle theta in between them for an object placed between the mirrors if angle is gradually increased from 0 degree to 180 degree how will the number of images change increase decrease or remain unchanged  
Asked by pritiswansi1996 | 28 Feb, 2021, 05:22: PM
answered-by-expert Expert Answer
If the angle between plane mirrors is zero, i.e. when mirrors are parallel and placing each other, we get infinite number of images.
 
If the angle between plane mirrors is 180o , we get only one image.
 
In between , if angle between the plane mirror is θ such that 360/θ = n and n is even we get n-1 images
 
If n is odd , we get n images
 
Hence when angle between plane mirrors changes from 0 to 180 , number of images changes from infinity to one.
 
As the angle increases number of images decreases.
Answered by Thiyagarajan K | 28 Feb, 2021, 06:07: PM
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