|

optics formulae.

New kid on the Block

Posted on
7 Feb 2008 10:27:34 IST
Posts: 5
7 Feb 2008 10:27:34 IST
0 people liked this
1
427
optics formulae.
Engineering Entrance , JEE Main , JEE Advanced , Physics , Optics

# Optics Formulas

## Equations for Geometrical Optics

 Law of Reflection States that the angle of incidence () is equal to the angle of reflection () as measured from the normal to the reflecting surface.
 Snell's Law Alternate Form Gives the relationship between angles of incidence () and angles of refraction () for a wave impinging on an interface between two media with different indices of refraction (, )
 Index of Refraction The index of refraction () is a ratio of speeds that compares the speed of light in a medium () to the speed of light in a vacuum (). The ratio can also be defined in terms of the wavelength () of light in different materials.
 Critical Angle The critical angle ()is the certain angle of incidence at a boundary between two materials where the angle of refraction equals 90°. This formula is used to calculate that angle, and works only if > . Note: if the second medium is air or a vacuum, then is approximately 1.

## Equations for Mirrors and Lenses

 Magnification Factor for Plane Mirrors Magnification Factor for Spherical Mirrors and Lenses Focal Length for a Spherical Mirror Spherical Mirror Equation Alternate Form Thin Lens Equation Alternate Form Note: the equations for spherical mirrors and thin lenses are the same.

## Equations for Young's Double-Slit Experiment

 Path Difference for Constructive Interference Path Difference for Destructive Interference Bright Fringe Condition(double slit interference) Wavelength(double slit interference) Width of Bright Fringe(double slit interference) Nonreflecting Film Thickness(minimum)

Blazing goIITian

Joined: 22 Apr 2007 11:21:45 IST
Posts: 2537
7 Feb 2008 11:34:02 IST
0 people liked this

the equations for spherical mirrors and thin lenses are the same only in RP sign convention.
In recent ( co-ordinate) sign convention for mirror its as u gave , but for lenses it is ( 1/ v ) - ( 1 / u ) = 1 / f

 Some HTML allowed. Keep your comments above the belt or risk having them deleted. Signup for a avatar to have your pictures show up by your comment If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team

## For Quick Info

Name

Mobile

E-mail

City

Class

Vertical Limit

Top Contributors
All Time This Month Last Week
1. Bipin Dubey
 Altitude - 16545 m Post - 7958
2. Himanshu
 Altitude - 10925 m Post - 3836
3. Hari Shankar
 Altitude - 9960 m Post - 2185
4. edison
 Altitude - 10815 m Post - 7797
5. Sagar Saxena
 Altitude - 8625 m Post - 8064