Class 10 Study Hub by Mayank

  Welcome to the world of mirrors and lenses! In this chapter, you’ll understand how light behaves , how images are formed , and the rules behind reflection and refraction . 🌟 What is Light? Light is a form of energy that enables us to see objects. It travels in straight lines and can reflect, refract, or be absorbed. 🔁 Reflection of Light 👉 Definition: Reflection is the bouncing back of light from a shiny surface (like a mirror). 🔄 Laws of Reflection: Incident ray , reflected ray , and normal all lie in the same plane . Angle of incidence = Angle of reflection 🪞 Types of Reflection Type Description Regular From smooth surfaces, clear image Irregular From rough surfaces, blurred image 🔍 Spherical Mirrors Two types: Concave (Converging) Convex (Diverging) Important Terms: Pole (P) : Center of mirror Focus (F) : Point where rays converge/diverge Center of curvature (C) : Center of the sphere Principal axis : Line passing through...

📘 Subject : Biology 🧑‍🏫 Class : 10 CBSE 🧪 Book : Science (NCERT) 🤔 What is Control and Coordination? It refers to the ability of an organism to respond to stimuli and regulate body functions using: Nervous system Endocrine system (hormones) 🧠 Control and Coordination in Animals 1. Nervous System 👉 Made of: Brain Spinal cord Nerves ➤ Neurons Functional unit of the nervous system Transmit electrical impulses 🔹 Parts: Part Function Dendrites Receive signals Axon Transmit signals Axon terminals Pass signal to next neuron 2. Human Nervous System Divided into: Central Nervous System (CNS) : Brain + Spinal Cord Peripheral Nervous System (PNS) : Nerves from CNS to body 🧠 Human Brain Part Function Cerebrum Thinking, memory, senses, voluntary actions Cerebellum Balance and posture Medulla (Brainstem) Involuntary actions like heartbeat, breathing ⚡ Reflex Action Quick, automatic response to a stimulus Example: removing hand...

 📘 Subject : Biology 🧑‍🏫 Class : 10 CBSE 🧪 Book : Science (NCERT) 🧠 What are Life Processes? Life processes are activities performed by living beings to maintain life such as: Nutrition Respiration Transportation Excretion 🍽️ 1. Nutrition 🔹 Definition : Process of taking in food and using it for energy, growth, repair. 🔸 Types of Nutrition : Type Example Autotrophic Plants Heterotrophic Animals, Humans 🌿 Autotrophic Nutrition (Photosynthesis) Occurs in green plants Uses sunlight, water, and CO₂ Equation : 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in presence of sunlight & chlorophyll) 🍖 Heterotrophic Nutrition : Holozoic (Humans) Saprophytic (Fungi) Parasitic (Cuscuta, leech) 💨 2. Respiration 🔹 Definition : Breakdown of food to release energy. 🔸 Types : Type With/Without O₂ End Product Aerobic With O₂ CO₂ + H₂O + Energy Anaerobic Without O₂ Alcohol + CO₂ + Less energy 🔸 Respiration in Humans : Occurs in mitochon...

📝 Summary This story is about a young thief (narrator) who changes his life because of the kindness shown to him by a simple man named Anil . The thief is just 15 years old. He lies to Anil to get work and is given shelter and food. Anil teaches him how to cook and write. One day, the thief steals 600 rupees from Anil and runs away. But his conscience troubles him . He realizes that if he runs away, he will lose the chance to become educated and a better man. He returns to Anil, quietly puts the money back , and decides to change his life . Anil knows the truth but says nothing. He only gives the boy a new note the next morning and continues treating him kindly. 👥 Characters 🧒 The Narrator (Thief) Young, clever, liar Learns from experience Finally reforms himself 👨 Anil Kind, simple, trusting Educates the thief Forgives silently 💡 Themes 🧠 Trust and betrayal ❤️ Power of kindness 🔁 Chance for change ✍️ Importance of education 🧠 Word Meanings W...