how an image form in camera?

Answer 1

Focus and click the shutter!

Answer 2

The most widely used photographic process is the black-and-white negative–positive system. In the camera the lens projects an image of the scene being photographed onto a film coated with light-sensitive silver salts, such as silver bromide. A shutter built into the lens admits light reflected from the scene for a given time to produce an invisible but developable image in the sensitized layer, thus exposing the film.

During development (in a darkroom) the silver salt crystals that have been struck by the light are converted into metallic silver, forming a visible deposit or density. The more light that reaches a given area of the film, the more silver salt is rendered developable and the denser the silver deposit that is formed there. An image of various brightness levels thus yields a picture in which these brightnesses are tonally reversed—a negative. Bright subject details record as dark or dense areas in the developed film; dark parts of the subject record as areas of low density; i.e., they have little silver. After development the film is treated with a fixing bath that dissolves away all undeveloped silver salt and so prevents subsequent darkening of such unexposed areas. Finally, a wash removes all soluble salts from the film emulsion, leaving a permanent negative silver image within the gelatin layer.

A positive picture is obtained by repeating this process. The usual procedure is enlargement: the negative is projected onto a sensitive paper carrying a silver halide emulsion similar to that used for the film. Exposure by the enlarger light source again yields a latent image of the negative. After a development and processing sequence the paper then bears a positive silver image. In contact printing the negative film and the paper are placed face to face in intimate contact and exposed by diffused light shining through the negative. The dense (black) portions of the negative image result in little exposure of the paper and, so, yield light image areas; thin portions of the negative let through more light and yield dark areas in the print, thus re-creating the light values of the original scene.

Answer 3

Camera merely means chamber. When lawyers meet "in camera" they meet within the judge's chamber (excluding the jury). A photographer's camera is a chamber (that excludes light) containing a flat plate of light sensitive film. The camera is much like a human eye. When you open your eye, light enters and is focused by your lens on the retina which makes an upside-down replica of the scene before you. The eye is like a motion picture camera because it can track a changing scene sending signals to the brain many times a second and erasing all previous scenes (except in memory). If you are looking at a white and a black circle, the black circle will absorb more photons than the white circle that reflects almost all light. Therefore, more photons (tiny massless packets of energy traveling at the speed of light) will reach your eye from the white circle. Because the circles will be focused on different areas of your retina, you can "see" the difference. Photographic film does the same thing except the exposure to light must be controlled. The photons make pemanent changes in the chemicals of the film and over-exposure will ruin the film. The exposed film must remain dark until it is washed in chemicals (developed) that will fix the picture on the negative preventing further light exposure. The negative is used to make a positive on the snapshot you can place in a scrap book. Controlled light passes through the negative onto the positive creating a reverse image (dark spots on the negative block light and vice versa). The positive must be washed in chemicals to fix the final photo. For black and white photography, the darkroom where film is developed can use dim red light which is too weak to damage the film. Colored film is often developed by blind people who need no light to work. The simplest cameras are "pinhole" cameras that need no lens to focus the light.

Answer 4

whenever you click on a camera, the negative inside it is exposed to light reflected from outside.
the negative is made up of material that is photosensitive.
that means, if light falls on such chemicals they form different type of compounds.
this change remains permanent and hence once used negative cannot be used again and again.
to get your photo the people at developing lab just reverse the process and get the photo!!!
in digital cameras, the processor controls the color and amount of light to be shown by each pixel on screen and hence a sharp and clear image you can see in digital cams.

Answer 5

hi rhema,
when we take a picture shutter is opened and clicked!!
a light comes out and this light is reflected by the objects in its
range into the camera itself.camera film is coated with a photo sensitive silver bromide and iodine mixture and when this reflected
light falls on this film it triggers the photo chemical decomposition
of silver bromide to silver ion and bromide ion.this silver is black in colour and this blach deposit is formed on the region where the reflected light had fallen.and light is reflected by solid objects and their inverted images are formed on the film as black silver deposit.
next, film is taken out in a dark place and developed
inverted