Human Eye and the Colourful World - 10 Imp Questions | Pre-Board Series for Class 10 | Sandeep Sir

✅ In this video, ✔ Class: 10th ✔ Subject: Science (Physics) ✔ Chapter: Reflection and Refraction (Chapter 9) ✔ Topics Covered in this Video - Sandeep Sir breaks down the complete mind map and 10 most important questions on The Human Eye and the Colourful World chapter into easy-to-understand concepts, covering: Structure and functioning of the human eye, Defects of vision and their corrections, Dispersion of light and the formation of a rainbow, Atmospheric refraction and related phenomena ▶️ Full Playlist Link -    • Class 10 Science  One Shot in 30 Minutes⏰&...   ✍️ Session PDF - https://vdnt.in/GjjwT ----------------------------------------------------------------------------- Important Time Stamps 00:00-5:20= Introduction 5:21-7:02= Assertion (A) : The rainbow is a natural spectrum of sunlight in the sky. Reason (R) : Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air. 7:03-10:12= A person is suffering from an eye defect in which the far point of the eye is nearer than infinity. Identify the defect. List two main causes of this defect. Draw a ray diagram to show how this defect is corrected by using a suitable lens. 10:13-12:36= (a) A narrow beam XY of white light is passing through a glass prism ABC as shown in the diagram: Trace it on your answer sheet and show the path of the emergent beam as observed on the screen PQ. Name of phenomenon observed and state its cause. 12:37-15:01= It is observed that the power of an eye to see nearby objects as well as far off objects diminishes with age. (i) Give reason for the above statement. (ii) Name the defect that is likely to arise in the eyes in such a condition. (iii) Draw a labelled ray diagram to show the type of corrective lens used for restoring the vision of such an eye. 15:02-18:29= Study the diagram given below and answer the questions that follow: (i) Name defect of vision represented in the diagram. Give reason for your answer. (ii) List two causes of this defect. (iii) With the help of a diagram show how this defect of vision is corrected. 18:30-22:40= How does refraction take place in the atmosphere? Why do stars twinkle but not the planets? 22:41-24:31= A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power 24:32-26:44= A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his textbook. Which of the following statements is correct? 26:45-29:08= At noon the sun appears white as 29:09-30:52=The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light 30:53-33:52= Is the position of a star as seen by us its true position? Justify your answer. ----------------------------------------------------------------------------- 📲💻 Join Vedantu 9 & 10 📲💻 Telegram Channel 👉 http://bit.ly/4cgW72K --------------------------------------------------------------------------------- #class10 #boardexam2025 #ncert #cbse #class10boards #resourcesanddevelopment #class10geographychapter1 #class10sst #surabhimam