This is a pin-hole camera. 2. A Pinhole camera is used to indirectly see the bright objects like the Sun. Q.1 Explain transparent, translucent and opaque objects with a suitable example of each. The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Light Page 7 of 8 Q10a. Shadows are not formed in dark i.e. In nature, solar eclipse and lunar eclipse are examples of shadow formation. NCERT Solution, Q & A Q1(MCQ): A body which emits light by itself is(a) Luminous body (b) Non-luminous body (c) Shadow (d) Opaque body Answer: (a) Luminous body Q2: Fill in the Blanks (i) Object like the sun that give out or emit light of their own are called _____ Object. Your email address will not be published. Light can completely pass through transparent objects, partially pass through translucent objects and do not pass through opaque objects. To understand straight pathway of light. For this, take a cylindrical tube; which can be easily bent. Periscope is based on which principal of light-, (a) Refraction of light                            (b) Reflection of light, (c) Diffraction of light                            (d) Interference of light, 14. Light and its Reflection. The dark coloured patch formed on the screen opposite to the light by an opaque object is called shadow. Source of light which is already present in nature known as natural source of light. Black coloured rays show the incident rays while the blue coloured rays show the reflected rays. Observation: When we peep through various materials, we find that: 1. Key Features of NCERT Material for Class 6 Science Chapter 11 – Light,Shadows and Reflection. 11. The darker part of shadow is called. It is based on straight pathway of light. Central inner part is darker than outer surrounding part. On the same side if the incidence angle is bigger, the shadow is smaller. (a) Figure 1 shows which type of reflection of light? (a) Screen         (b) Light               (c) Opaque object             (d) All of these, 13. (a) The shape changes but size remains same, (b)The size changes but the shape remains same, (a) Air                     (b) water                  (c) Light                       (d) Soil. Right side of the object appears to be left in image and vice-versa. An object which is known as a source of light. Choose three statements that are correct. e. g. The light coming out of a torch, motor car, The Sun etc. The opposite side was used for viewing the image. It can be smaller than object, bigger than object or same size to object. Those objects through which light cannot pass are called opaque objects. Theory- The shadow is dark coloured optical image formed on the screen by an opaque object on opposite side of the source of light. 8. 1. This concept is well proved with a smaller size of shadow in the evening and noon and bigger size of shadow in the morning. Q.2 Differentiate between luminous and non-luminous objects. Mirrors reflect the light falling on them. In order to score good marks, students need to study the answers given in this solution. Mirror is an object which reflects light. Key Learning Points-Introduction, Sources of light, Luminous and Non-luminous objects, Transparent, Translucent and Opaque Objects, Straight pathway of Light, Shadow, Differences between shadow and image, A Pinhole Camera, Mirror and Reflection of Light, Learning Objectives– At the end of this lesson the students will be able to-, 1. Prepared by teachers of the best CBSE schools in India. e.g.- Muddy water, smoky glass, oiled paper, milk etc. Luminous vs Non-Luminous Objects Rectilinear Propagation of Light What is Reflection? When a ray of light falls on an opaque object, a dark patch is formed on the other side of the object whether it is on ground or it is on screen present on the other side of the object. 2. There are two types of reflection of light- i. It is a form of energy which makes objects visible as we cannot see objects in darkness.During day time sunlight acts as a source of energy which makes everything visible whereas at night we use artificial sources of light for seeing objects. Reflection is the phenomenon when light is reflected back by some object and materials. Which of the following will not form a rectangular shadow? Fill in the blanks. e.g.- Air, Clean Water, Clear glass, spectacles etc. CLASS TEST 2    Time=30 Minutes   Marks= 4 x 5 =20. Activity 3-Shadow formation by an opaque object. When a ray of light falls on a surface like glass which has shiny and glossy properties from where light gets reflected. Central inner part is darker than outer surrounding part. Prepare a Pinhole camera and write its construction and working. – It is a simple device to indirectly see the bright objects. Some materials like glass, spectacle, lens etc. Sorry!, This page is not available for now to bookmark. Your email address will not be published. Q.4 Write any three differences between an image and a shadow. Natural Source of Light: Source of light which is already present in nature known as natural source of light. The sunlight passing through the leaves of a large tree produces numerous circular images of the sun on the ground. The darker part of shadow is called umbra and less dark part is called penumbra. An iron ball . 1) When an object blocks the path of light, what is formed? Mirror- Mirrors are reflective pieces of glass one side of which is silvered. What is shadow? Sort out the objects given below into-, (a) Natural sources and artificial sources of light, The Earth, Apple, Glowing bulb, The Sun, School bag, Book, Football, Torch,   Fireflies, Lighter, Mobile Phone, Ink Pen, and Crayons, PISA TYPE/ HOTS TYPE QUESTIONS-    Time = 15 minutes   Total marks =1 x 5=5, Fig.1                                                             Fig.2, Look at the two above figures. For the formation of a shadow, a source of light, an opaque object and a screen are required. Why the direction of light changes when light falls on plane mirror? The light travels always in linear or rectilinear or straight pathway. Why? Bujhoo and Paheli observed the shadow of a tree at 9:00 A.M., 12:00 P.M. and   3:00 P.M. A piece of glass . For the formation of a shadow, a source of light, an opaque object and a screen are required. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Which of the following is kept at position A to get this patch of light? We cannot see through an opaque object. (a) Opaque object         (b) Transparent object      (c) Air      (d) Mirror. Light travels in (a) straight line (b) curved line (c) zig-zag line (d) randomly. The shadows are not uniformly dark. (d) Light gives us sense of vision. (i) On the diagram above draw a ray of light to show how George sees the light from the lamp reflected by the laptop screen. Shiny and polished surfaces usually act as mirrors. Regular reflection. in absence of light. 12. Activity 2-To demonstrate straight pathway of light, Requirements- Candle, match box, hollow pipe, bended hollow pipe or pipe prepared of paper. Example: Sun, bulb, etc. Classify Objects Based on its Light Producing Property? Reflection occurs mainly on the mirror surface as incident light gets reflected when it falls on a clear surface and due to reflection the image formed is always erect. CBSE Class 6 Science Notes Chapter 11 Light, Shadows and Reflection. 4. Q.3 Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in other way? Write the two characteristics of images formed by a mirror? 6. But, its direction changes due to air. This is the reason we can see objects in a pinhole camera. Transparent, Translucent and Opaque Objects. The light is produced by natural as well as artificial (man-made) objects. Q.4 What is shadow? -Introduction, Sources of light, Luminous and Non-luminous objects, Transparent, Translucent and Opaque Objects, Straight pathway of Light, Shadow, Differences between shadow and image, A Pinhole Camera, Mirror and Reflection of Light, At the end of this lesson the students will be able to-. During reflection angle of incidence is equal to angle of reflection. – Light plays a very crucial role in our daily life. We cannot see through an opaque object. – Those objects through which light can pass completely are called transparent objects. We can see through a translucent object but the vision would be murky. The colour of shadow is dark irrespective of the colour of object. a) A shadow b) A reflection c) A fog d) A problem 2) When an object moves closer to a light source, its shadow... a) Gets smaller b) Gets bigger c) Changes shape d) Stays the same size 3) The sun shines on a person, creating a shadow. Question 1. Reflection occurs mainly on the mirror surface as incident light gets reflected when it falls on a clear surface and due to reflection the image formed is always erect. NCERT Solutions for Class 6 Science Chapter 11 Light, Shadows and Reflections is an important resource material for the students who are preparing for CBSE board class 6 science examination. (iii) _____ are formed when an opaque object comes in the path of light Give two examples each of natural and artificial sources of light. It works on the principle of straight pathway of light. WASTE WATER STORY Class 7 Chapter 18, GARBAGE IN, GARBAGE OUT CLASS 6 CHAPTER 16, REACHING THE AGE OF ADOLESCENCE CLASS 8 CHAPTER 10, WATER: A PRECIOUS RESOURCE CHAPTER 16 CLASS 7. To understand straight pathway of light. in absence of light. Formation of shadows suggest that light travels in _____ lines. (a) A ball     (b) A ruler scale    (c) A circular steel tumbler   (d) An ice-cream cone. 1. It is used to view objects like trees and buildings. From the experiment below we will prove that light travels in a straight line i.e path covered by light is alway straight.