By seeing images in a plane mirror rithvik got doubts in his mind what would be those doubts

The spot of light on the wall is an image of the bulb in the torch (flashlight for Americans). However, it is an extremely blurry image; you cannot see the shape of the filament inside the bulb on the wall. This is because the aperture of the torch is large.

Look at the picture below. Imagine that the red T on the left is the filament of the torch, the middle lines with a gap are the edges of the torch aperture, and the blurry upside-down T on the right is the image on the wall. The diagonal lines crossing from left to right show the different light rays leaving the filament in differnt directions and still hitting the image plane.

Because light from a single point on the filament can reach multiple locations on the image plane, the image is blurry since the images of different points on the filament overlap each other. You can imagine that as the aperture in the middle gets larger, the T will become more blurry until it becomes an unrecognizable circle.

The flat mirror does not create the image on the wall, the aperture of the torch does. You can tell this because the spot on the wall is the same whether you shine the torch directly at the wall or by bouncing the light off the flat mirror. In the same way a pinhole camera can create an image, the finite aperture of the torch can create an image of the torch bulb on the wall, blurry though it may be.

If you replaced the torch with a candle or a bare bulb, then no image would form anywhere on a wall after reflecting off the mirror. No optical system (whether lens or aperture) means no image.

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