Concave mirror : Concave mirror is the part of the hollow sphere whose outer surface is silvered and the inner surface acts as reflecting surface (fig.).Spherical mirrors are the reflecting part of spherical surface. Plane mirrors are used in periscopes usually used in submarines. Plane mirrors are used in a solar cooker to reflect the sun light. Plane mirror is used in a solar cooker to reflect the sun light. The image formed by a plane mirror is laterally inverted i.e., the left hand appears as right hand and vice-versa. Suppose, an object is placed at 5 cm in front of a plane mirror then its image will be at 5 cm behind he plane mirror. The image formed by a plane mirror is at the same distance behind the mirror as the object is in front of it. If object is 10 cm high, then the image of the object will also be 10 cm high. The size of the image formed by a plane mirror is same as that of the size of the object. The image formed by a plane mirror is erect. The image formed by a plane mirror is virtual. Characteristics of the image formed by a plane mirror In daily life when we see the image of our face formed by a plane mirror cannot be obtained on a screen it can be seen only by looking into the mirror. A virtual image is seen only by looking into a the mirror or a lens. Virtual image formed by concave lens and convex mirrorīecause the image will not obtained on a the real screen then it is called a virtual image. Because the rays never really converge, one cannot project a virtual image. Then it will appear to converge in a point or behind the mirror or lens. In the same way, we can define virtual image as an image in which the outgoing rays from a point on the object always diverge from it. In this processes the image formed on the screen is real image. In the ray diagrams (such as the images on the right), real rays of light are always represented by full, solid lines that give the indication that it is real.Ī real image is formed when light rays coming from an object actually meet at a point after reflection from a mirror or refraction through a lens. In different types of mirror or lens the images appears are different some of the examples of real images includes the image seen on a cinema screen in this process the source or picture being the projector on screen, the image produced on a detector in the rear of a camera, and the image produced on an eyeball retina.
If we will fix a screen in front of mirror or lens then a real image appear and the image will generally become visible on the screen.
A real image is an image that the light rays from the object actually pass through a virtual image is formed because the light rays can be extended back to meet at the image position, but they don't actually go through the image position.In study of light, Let an object O is placed then a real imageexist which the perceived location is actually a point of convergence of the rays of light that make up the image. A convex mirror can only form virtual images. Concave mirrors can form either real or virtual images, depending on where the object is. If the mirror's inside surface is reflective, the mirror is concave if the outside is reflective, it's a convex mirror. Parabolic mirrors are really the only mirrors that focus parallel rays to a single point, but as long as the rays don't get too far from the principal axis then the equation above applies for spherical mirrors. The focal length, f, is:įocal length of a spherical mirror : f = R / 2 The focal point F (the point where parallel rays are focused) is located half the distance from the mirror to the center of curvature. R, the mirror's radius of curvature is the radius of the sphere. Its center of curvature, C, is the center of the sphere it was cut from. The image formed by any mirror is located either where the reflected light converges, or where the reflected light appears to diverge from.Ī spherical mirror is simply a piece cut out of a reflective sphere.
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