CBSE Class 12 Physics Ray Optics Formula list: Ray Optics is an important chapter for CBSE Class 12 students. Usually, four marker questions from the chapter are asked in the CBSE Board Examinations. Derivations, formulas, ray diagrams, and important concepts from ray optics and optical instruments are vital for scoring high marks in Class 12 Physics.
We understand that it is difficult for students to keep looking for formulas and ray diagrams all around the chapter while solving NCERT questions or practicing NCERT Solutions. So, we have provided here a complete list of formulas and ray diagrams for CBSE Class 12 Physics Chapter 9, Ray Optics and Optical Instruments. A PDF download link has also been attached below for future reference.
It is equally important for students to keep a formula list handy during examinations, to quickly memorize the important formulas required for solving numerical. Also, for this chapter, ray diagrams are essential because these can be directly asked in the CBSE Board Examinations. Thus, students must have a look at the list presented below and they should also download the PDF to keep it ready for future use.
Related:
CBSE Class 12 Physics Syllabus 2023-2024
CBSE Class 12 Physics Deleted Syllabus 2023-2024
CBSE Class 12 Physics Sample Paper 2023-2024
CBSE Class 12 Physics Chapter 9, Ray Optics and Optical Instruments Formula List is presented below:
Formulas:
Focal Length (f) = R/2
Mirror Equation= 1/v + 1/u = 1f
Linear Magnification (m) = height of the image/ height of the object
= h’/ h
Magnification Formula = - v/u
Snell’s law of refraction/Refractive Index= sin i/sin r
Apparent depth = Real depth/ Refractive Index of the medium
Relation between object and image distance = [n2/v - n1/u]= (n2-n1)/R
Lens Maker's Formula = 
Power of lens (P)= 1/f
Total magnification= product of multiple magnifications (m1 x m2 x m3….)
Total power of lens (P)= P1 + P2 + P3+ …….
Minimum Deviation = (n 21- 1)/A
Magnification in simple microscope (m) = 1+ D/f
Total Magnification = Mo x Me
= [ (L/fo) x (D/fe) ]
Length of telescope tube = fo + fe
Magnification of telescope = fo/fe
CBSE Class 12 Physics Chapter 9, Ray Optics and Optical Instruments Ray Diagrams are presented below:
Ray Diagrams
Reflection of light by spherical mirrors
Sign Convention
Concave mirror when rays are paraxial
Convex mirror when rays are paraxial
Formation of Focal Plane
Image formation by a concave mirror
Image formation by a concave mirror with object between P and F
Image formation by a convex mirror
Refraction of light
Lateral shift of a ray refracted through a parallel-sided lab
Apparent depth for a)normal viewing b)oblique viewing
Total Internal Reflection
Refraction at a spherical surface
Position of object and image formed by a double convex lens
Refraction at the first spherical surface
Refraction at the second spherical surface
Tracing rays through convex lens
Concave Lens
Power of a lens
Image formation by a combination of two thin lenses in contact
Refraction through a glass prism
Simple Microscope, magnifying glass is located such that the image is at the near point
Simple Microscope, the angle subtended by the object is same as that of the near point
Simple Microscope, the object near the focal point of the lens, the image is far off but closer than infinity
Formation of image by compound microscope
Refracting Telescope
Reflecting Telescope (Cassegrain)
Important to Note:
Value of speed of light in vacuum (c)- 3 x 108 m/s
SI unit for the power of lens is Dioptre (D)
To download the Formula list and Ray Diagrams for CBSE Class 12 Physics Chapter 9, Ray Optics and optical instruments, click on the link below
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