SPOT
The radius of curvature of a spherical
VI. Numerical problems.
1.
mirror is 25 cm. Find its focal length.
2.
If two plane mirrors are inclined to each
other at an angle of 45°, find the number
of images formed.
dizer = 360 = 8-12
Con
722 =360/60=5~1=5Proges
Answers
Answer:
answr
search
What would you like to ask?
8th
Physics
Light
Multiple Images
Find number of images forme...
PHYSICS
Find number of images formed according to given case
319009
MEDIUM
Share
Study later
ANSWER
If the image of an object is viewed in two plane mirrors that are inclined to each other more than one image is formed. The number of images depends on the angle between the two mirrors.
The number of images formed in two plane mirrors inclined at an angle A to each other is given by the below formula.Number of images n= 360/A - 1
The number of images formed n=(360/A)-1, if (360/A) is even integer.If (360/A) is odd integer, the number of images formed n=(360/A)-1 when the object is kept symmetrically, and n=(360/A) when object is kept asymmetrically.
If (360/A) is a fraction, the number of images formed is equal to its integral part.
As the angle gets smaller (down to 0 degrees when the mirrors are facing each other and parallel) the smaller the angle the greater the number of images.
Here, the angle A between the mirrors is 40 degrees.
Case (a): The object is symmetrically placed.
The number of images formed = (360/40)-1, we get 8 images.
Case (b): The object is asymmetrically placed.
The number of images formed = (360/40), we get 9 images.
Hence, the number of images formed are 8 and 9 respectively.