A student performs an experiment using a spherical lens. He placed the object far away from the lens. The image formed is inverted and is produced on a screen placed on the opposite side of the lens. Which lens is being used by the student for the experiment
Answers
Explanation:
Lens: A transparent material bound by two surfaces, of which one or both surfaces are spherical, forms a lens.
Convex lens: Convex lens is a transparent curved device that is used to refract light. A lens is usually made from glass. There are two different shapes for lenses. They are called convex and concave lens. A convex lens is thicker in the middle and thinner at the edges, it is also called a converging lens. A convex lens will focus light and make a real and inverted image. The size of the image will depend on the position of the object and lens.
Concave lens: A concave lens is thinner in the middle and thicker at the edges. A concave lens is also called a diverging lens. A concave lens will disperse light and make an image that is always virtual, upright and smaller than the object.
Principal axis: The principal axis is a line that is perpendicular to and passes through the centre of the lens.
Principal focus: The principal focus, F is the point through which all incident rays travelling parallel to the principal axis after refraction appear to meet.
The focal length “ƒ’ is the distance from the center of the lens, O to the principal focus, F.
Centre of curvature of lens: A convex lens is made up of two spherical surfaces. These surfaces are the parts of a sphere. The centre of these spheres are called centres of curvature of the lens. It is represented by
NCERT Class 10 Science Lab Manual Image Formation by a Convex Lens 1
Optical centre: The central point of a lens is its optical centre (O).