Question

calculate the number of images formed in two mirrors when they are held at an angle of 90°​

Answer 1

Answer:

3 images are formed! coz as it is 2 mirrors at angle of 90°

Explanation:

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Answer 2

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How many images will be formed if two plane mirrors placed at angle 90 degree?

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The number of images formed when two mirrors are placed at an angle theta to each other is given by:

n = ( 360 / theta ) - 1

So, here, we have the mirrors placed perpendicular to each other. So, theta = 90 degree

=> n = no. of images formed

=> n = ( 360 / 90 ) - 1

=> n = 4 - 1

=> n = 3

So, a total of three images will be formed.

Even if you try it practically, one of the images will be formed at the junction of the two mirrors.

You can also try for different angles.

Similarly, when the 2 mirrors are placed parallel to each other, theta = 0 degree

So, number of images formed = infinite

Also, when the two mirrors are placed side by side, theta = 180 degree

=> n = ( 360 / 180 ) - 1

=> n= 2 - 1

=> n = 1

And hence, only one image is formed as a whole.

Thus, the images formed will be 9. So, 360∘90∘= 4, where 4 is an even number. Thus, the images formed will be 3.

The number of images formed by two plane mirrors placed at angle A degree is

n=\frac{360}{A}-1n=

A

360

−1

If A=90 degree

n=\frac{360}{90}-1=3n=

90

360

−1=3

If A=180 degree

n=\frac{360}{180}-1=1n=

180

360

−1=1

.

.

.

.

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