Optics - Lecture 01: Ray Optics

A collection of vocabulary flashcards covering the fundamental laws of reflection, vector representations, plane mirror properties, and required textbook references as discussed in the Ray Optics lecture.

Law of Reflection

The principle stating that the angle of incidence ($\angle i$) is equal to the angle of reflection ($\angle r$), and that the incident ray, reflected ray, and normal all lie in the same plane.

Angle of Deviation ($\delta$)

The angle through which a ray of light is turned from its original direction after reflection, calculated by the formula $\delta = 180 - 2\times\text{i}$ or $\delta = 180 - 2\times\text{r}$..

Converging Rays

Light rays that come together and meet at a common point.

Diverging Rays

Light rays that spread out or move away from a common point.

Vector Form of Reflection

The mathematical representation of reflection where the coplanar nature of the incident ray ($\text{ki}$), reflected ray ($\text{kr}$), and normal ($\text{n}$) is expressed by the scalar triple product equation $\hat{n} \text{.} ( \text{ki} \times \text{kr} ) = 0$.

Normal Incidence

A specific case of reflection where $\angle i = \text{r} = 0$, causing the light ray to retrace its original path.

Grazing Angle

A condition where $\angle i = \text{r} = 90^{\text{o}}$, leading to an angle of deviation $\delta = 0^{\text{o}}$.

Mirror Rotation Effect

If a plane mirror is rotated by an angle $\theta$, the reflected ray rotates by an angle of $2\theta$.

Plane Mirror Image Characteristics

A plane mirror produces a virtual image where the object distance ($u$) equals the image distance ($v$), and the image undergoes lateral inversion but no vertical inversion.

Image (Optical Definition)

The point of intersection of reflected rays or refracted rays.

Minimum Mirror Length for Full-Length Image

The minimum height of a plane mirror required to view an entire object is half of the object's height ($\frac{h}{2}$).

Mirror Placement (JAM 2016)

To see a full-length image of a person of height $h$ with top-to-eye distance $\delta$, the bottom edge of a mirror of height $\frac{h}{2}$ must be placed at a distance of \frac{h - \text{\delta}}{2} above the floor.

HC Verma

One of the recommended textbooks for studying the concepts of Ray Optics and Wave Optics.

Ajay Ghatak

The author of 'Optics', recommended for the study of Wave Optics topics like Interference, Diffraction, and Polarisation.

N. Subramanyem

The author of a recommended textbook used for studying the subject of Optics.