|Class 8 Physics Light||Image formation at angled Mirrors|
Image formation at angled Mirrors
When two mirrors are placed a various angles w.r.t each other, the light gets reflected over and over again it forms, multiple images.
Let M1 and M2 be 2 mirrors. Object O is the object.
If of angle between the mirrors is 90 degrees : Three images are formed. (Case i)
If the angle between the mirrors is 0 degrees ie mirrors being parallel to each other: Infinite images are formed.(Case ii)
Going by this, as the angle decreases from 90 to 0, the number of images keeps increasing. Recall the case of a Kaleidoscope wherein the angle between the mirrors is 60 degrees. So, many images(>3, 3 images are formed for 90 degrees) are formed.
Periscope: Periscope is an example wherein mirrors are placed at 45 degrees w.r.t each other.
Periscopes are commonly used in submarines and military mainly for spying that is for observation from concealed positions. For a submarine which is deep inside the water, the surface and the objects above cannot be seen otherwise. But, by fitting a periscope, objects on the surface and outside can be viewed inside the submarine