roborahull said:a concave mirror of 5cm radius of curvature whose circular ring has a radius of 4cm is blackened except for a narrow strip round the edge. A beam of light parallel to the principal axis falls on the mirror. Find the distance between the centre of curvature of mirror and the point at which light is focused.
Geometric optics is a branch of physics that studies the behavior of light in terms of rays and its interaction with different mediums and surfaces. It is based on the principles of reflection, refraction, and the law of least time.
The key concepts in geometric optics include the ray model of light, which states that light travels in straight lines, and the principles of reflection and refraction, which describe how light behaves when it encounters a surface or medium with a different optical density.
Geometric optics has many practical applications, such as in the design of lenses and mirrors for optical devices such as cameras and microscopes. It is also used in the construction of optical instruments for measuring and manipulating light, such as telescopes and lasers.
Geometric optics deals with the behavior of light as rays and focuses on the macroscopic properties of light, such as reflection and refraction. On the other hand, physical optics considers the wave nature of light and focuses on microscopic phenomena such as interference and diffraction.
The human eye uses the principles of geometric optics to focus light onto the retina, where the image is formed. The cornea and lens in the eye act as convex lenses to refract light and adjust its focus, allowing us to see objects at different distances clearly.