What is called the magnification of an image? Derive the formula of magnification for spherical lens.
Page 46 Chapter - 2.Reflection and Refraction
Answers
Answer:
Spherical mirrors are the mirrors having curved surfaces which are painted on one of their sides. Spherical mirrors in which inward surfaces are painted are known as convex mirrors while the mirrors in which outward surfaces are painted are known as concave mirrors.
- spherical mirrors
Concave mirrors are also known as converging mirrors since the rays converge after falling on the concave mirror while, the convex mirrors are known as diverging mirrors as the rays diverge after falling on the convex mirror.
Let’s learn about formula and magnification produced by spherical mirrors.
Spherical Mirror Formula
The Mirror formula explains how object distance (u) and image distance (v) are related to the focal length of a spherical mirror. Object distance is the distance of the object from the pole of the mirror; denoted by the letter u. Image distance is the distance of the image from the pole of the mirror and it is denoted by the letter v. And focal length is the distance of the principal focus from the pole of the mirror. The expression which gives the relation between these three quantities is called the mirror formula which is given as:
1v+1u=1f
Mirror formula is applicable for all spherical mirrors for every position of the object.
Explanation:
Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.
Typically, magnification is related to scaling up visuals or images to be able to see more detail, increasing resolution, using microscope, printing techniques, or digital processing. In all cases, the magnification of the image does not change the perspective of the image.
Some optical instruments provide visual aid by magnifying small or distant subjects.
A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye.
A telescope, which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image closely with a smaller eyepiece lens, thus making the object look larger.