CBSE 12th

The are various important topics often asked in the competitve exams an even in board exams related to the Class 12 Physics Ch 9 Ray Optics such as:

• Reflection of Light

• Refraction of Light

• Total Internal Reflection

• Lens Maker's Formula

• Power of a Lens

• Combination of Lenses

• Optical Instruments

• Huygens' Principle

These topics are important to understand the behavior of light and its applications in optical devices. Understand these concepts will help students answer questions related to theory and numerical problems in board and entrance exams.

Class 12 Physics Ch 9 Ray Optics helps students understand the fundamental concepts on how light interacts with optical systems such as mirrors and lenses. This chapter helps students to build the basis for many real-world applications, such as vision correction, telescopes, microscopy, and fiber optics. Also, there are important concepts like refraction, reflection, and total internal reflection are often asked in board exams and competitive exams like JEE and NEET, so being aware of this Class 12 Physics Chapter 9 Ray Optics is important for scoring well.

Under the newly introduced evaluation structure, internal assessments will play a greater role in determining a student's final grade, now accounting for 40 percent. The remaining 60% based on final board exams. This includes projects, periodic tests, and assignments. The revised structure ensures a more holistic evaluation of students' abilities throughout the year.

No ,you can't take admission based on class 10 th marksheet you need to show 12th marksheet. Normal colleges would give you admissions easily or they may take an entrance test. If you still want to have good percentage in 12 th you may give improvement.

CBSE past question papers for Class 12 History are available at the official site of CBSE which is cbse.gov.in. Under the tab "Examinations", one can either select Previous Year Question Papers or Question Paper for Term I/II. Papers for recent years including 2023-24 can be downloaded free of cost in PDF format by clicking on the relevant year and subject (History, code 027).

Alternatively, cbseacademic.nic.in has a standard establishment under Question Papers with marking schemes. The examination papers for the 2024-2025 period might be uploaded by the last week of March 2025, post exams, which would be around May-June 2025. 

To appear for the CBSE Class 12th improvement exam, you need to pass the main examination in the current year (2025), then apply online through the CBSE Open School, and appear for the exam in the subjects you wish to improve. 

Here's a more detailed breakdown:

1. Eligibility:

You must have passed the main CBSE Class 12th examination held in the current year (March 2025). 

You can choose to improve your performance in one or more subjects. 

Several physical properties shows attributes due the presence of halogen atoms, students can check few notable and important changes below;

• Boiling Point Increases with increasing molecular mass and van there Waals forces.
• Halogen-containing compounds are denser than hydrocarbons.
• Insoluble in water (due to non-polar nature) but soluble in organic solvents.

Haloalkenes are organic compound in which halogen atoms are bonded with carbon atom with C-X bond. There are several chemical reactions which are really important for the CBSE and other exam perspective. Students cna check below;

• Nucleophilic Substitution Reactions
• Elimination Reactions
• Reaction with Metals
• Wurtz Reaction 
• Grignard Reagent Formation