Ncert 12th Physics Chapter-9

Thin Lens Formula

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Thin Lens Formula: It is a relation between focal length of a lens and distance of object and image from optical centre of the lens. Let O be the optical centre and f be the principal focus of a convex lens of focal length OF= f,  Distance of […]

Thin Lens Formula Read More »

Lens

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Lens: Lens is a transparent refracting medium bounded by two surfaces, one of which must be spherical. Lenses are two types- (I) Convex or converging lens (II) Concave or diverging lens Convex Lens: A lens which is thicker at the centre and thinner at its ends is called

Lens Read More »

Total Internal Reflection(TIR)

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Total Internal Reflection(TIR): When a Ray of light strikes the interface at the angle greater than Critical Angle, it comes back in the same medium, this phenomenon is called total internal reflection(TIR). Necessary Conditions for TIR:  1. The light must travel from denser to rarer medium. 2. Angle

Total Internal Reflection(TIR) Read More »

Law of Refraction

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Law of Refraction: First Law:- The incident ray, the refracted ray and the normal to the refracting surface at the point of incidence, all lie in the same plane. Second Law(Snell’s Law):- The ratio of the sine angle of incidence to the Sine angle of refraction is constant

Law of Refraction Read More »

Refraction

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Refraction: The bending of light when it passes from one medium to another of different optical density is called refraction. When a beam of light encounters another transparent medium, a part of light gets reflected back into the first medium, while the rest enters the other. The direction

Refraction Read More »

Linear Magnification

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Linear Magnification: The ratio of the height of the image(h´) formed by a spherical mirror to the height of the object(h) is called the linear magnification produced by the spherical mirror. It is denoted by m.          m= h´/h

Linear Magnification Read More »

Mirror Formula

Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Mirror Formula: We consider and object AB placed on the principal axis beyond the centre of curvature C of a concave mirror of small aperture. A ray AM from the object travels parallel to the principal axis and after reflection from the mirror it passes through focus F.

Mirror Formula Read More »

Scroll to Top