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reflection of light
Ans:1 projector has a lens inside and the image is projected through this lens and this makes an image on the screen.
Ans:2 that is due to reflected rays, rays originated from the camera and then reflected from obj to us, so due to that our image will be there.
Ans:3 A plane mirror has an infinite focal length due to the straight shape of mirror. Since its radius is infinite. Use the lens makers equation,
namely (1/image distance) + (1/object distance) = (1/focal length).
Solve this to get,
(1/object distance) = -(1/image distance)
since (1/focal length) = 0.
The negative sign just means that the image is to the left of the mirror.
Since (1/object distance) = -(1/image distance),
object distance = -(image distance).
That’s why plane mirror me image object ke he size ki or same distance pe banti hai jitni distance pe object rahki hoti hai