She has started this educational website with the mindset of spreading Free Education to everyone. Question 2 The image formed by concave lens is seen to be virtual,erect and highly diminished than the object.What is the position of the object? Images formed by Concave lens. A ray incident parallel to the principal axis of a convex mirror after reflection will appear to comefrom the focus. Using rule 1, draw a line from the top of the object, parallel to the principal axis, to the mid-plane of the lens, then draw the refracted ray line from the mid-plane of the lens, as if it is coming from the opposite focal point. The perpendicular distance above principal axis is +ve. Images formed by convex lens. Question 1. Use lens formula to determine the position of the image formed. Ray diagram through the convex lens: Concave Lens Ray Diagram Class 10; CBSE Class 10 Science Lab Manual Experiment 7. With a concave lens, the image will always be diminished, the right way up and virtual. Draw the ray diagrams showing the image formation by a concave lens. Answer: Given:- ... A concave lens of focal length 15 cm forms an image 10 cm from the lens. Draw ray diagram to justify this statement stating the position of the object with respect to the lens in each case. Steps for Drawing Ray Diagrams for Concave Lenses. A ray directed towards center of curvature of convex mirror is reflected … Home Science Rules Ray Diagram NCERT Rules Ray Diagram Science Chapter Class 10 Rules for obtaining ray diagram formed by convex mirror. Question 3 Where should an object be placed in front of a concave lens so as to obtain image between focus and optical centre? Concave Mirror. When a ray, parallel to the principal axis strikes concave or convex lenses, the reflected ray passes through a focus on the principal axis. Ray diagram helps us to study the nature, position and relative size of the image formed by lenses. Answer: 2)Distances measured in direction of propagation of incident ray of light are taken as positive,while distances measured in a direction opposite to the direction of incident ray of incident are taken as negative. (a) Concave mirror as well as convex lens (b) Convex mirror as well as concave lens (c) Two plane mirrors placed at 90° to each other (d) Concave mirror as well as concave lens 2. 2)It is highly diminished,virtual and erect. Here, Object AB is at 2F 1. A ray directed towards center of curvature of convex mirror is reflected back along the same path . Describe the properties of an image produced by a concave lens. A ray incident parallel to the principal axis of a convex mirror after reflection will appear to comefrom the focus. Object is at infinity. 1)Image is formed between focus and optical centre of the lens. Class 10 - Physics - Light Reflection Refraction. Aim To find the image distance for varying object distances in case of a convex lens and draw corresponding ray diagrams to show the nature of image formed. Draw the ray diagram and find the position, size and the nature of the image formed. Question 1 What are the sign conventions for measuring the distances for spherical lens? Step 2. A 10 mm long awl pin is placed vertically in front of a concave mirror. 1)Image is formed between focus and optical centre of the lens. Concave Lenses Draw a ray diagram to show how an image is formed by a concave lens. The ray passing through the focal point becomes parallel to the principal axis after refraction by the lens. Theory. Object is beyond 2 F 1 A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. If a hollow sphere is cut into parts and the outer surface of the cut part is painted, … For drawing ray diagrams we first consider how light rays falling on both concave and convex lens in three different ways get refracted. Note : If m is +ve the image is virtual and erect. 3)Upward heights wrt principal axis are taken as positive,downward height wrt to ray of light are taken as negative. Required fields are marked *. Focal length, f = - 15 cm [f is - ve for a concave lens] Image distance, v = - 10 cm [Concave lens forms virtual image on same side as the object, so v is - ve] As, Object distance, Drawing the ray diagram: Using a scale of 1: 5, we get v = - 2 cm, f = - 3 cm. Your email address will not be published. Your email address will not be published. The perpendicular distance below principal axis is -ve. ... An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 1 Comment. Object is between infinity and optical centre of lens. Answer: Extra Questions for Class 10 Science Chapter 10 Short Answer Type I. First, we draw a ray parallel to principal axis. A ray directed towards the focus of a convex mirror after reflection will become parallel to the principal axis. Filed Under: Class 10, Light-Reflection and Refraction Tagged With: object is at infinity., object is between infinity and optical centre of lens, sign conventions. (Delhi 2015) Answer: Object is between infinity and optical centre of lens. A ray incident obliquely at the pole of convex mirror is reflected obliquely by making equal angle of incidence and reflection with the principal axis. Note :If m is –ve the image is real and inverted. A ray directed towards the focus of a convex mirror after reflection will become parallel to the principal axis. Object is at infinity. 1)All distances are measured from optical centre of a lens. 2)It is virtual and erect. object is between infinity and optical centre of lens, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. Ray diagram for concave lens. 1)Image is formed at F 1. The following diagrams show the ray diagram for a concave lens. 2)It is highly diminished,virtual and erect. Sign conventions for spherical lenses Convex Lens Experiment Class 10. A ray incident parallel to the principal axis of a convex mirror after reflection will appear to comefrom the focus. Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water. When a ray strikes concave or convex lenses obliquely at its pole, it continues to follow its path. An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. All the distance should be measured from the pole of the mirror. The distance measured against direction of incident ray is taken negative. Step 1. 2)It is diminished,real and inverted. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. NCERT Rules Ray Diagram Science Chapter Class 10 Rules for obtaining ray diagram formed by convex mirror. The magnification produced by a spherical mirror is the ratio of height of image to height of object. 3)A ray passing through optical centre of the lens. Guidelines for rays falling on the concave and convex lenses. The distance measured along direction of incident ray is taken positive. We draw another ray which passes through… Download PDF. 1)Image is formed at second principal focus F 2. The object should be placed on the left side and front of the image. A ray passing through optical centre travels undeviated after passing through lens.