Answer: Question 22. A 1.5 cm high object is placed at a distance of 25 cm from a concave mirror. (i) for a light ray in air be 45° and the angle of refraction (r) in glass be 30°, find refractive index of glass with respect to air. (c) Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object. Large concave mirrors are used to concentrate sunlight to produce heat in solar furnace. Question 5. What type of mirror and lens are these? This phenomenon is called total internal reflection. naidusridhar693 naidusridhar693 2 hours ago Physics Secondary School Derive relative refractive index 1 See answer naidusridhar693 is waiting for your help. A truck uses a convex mirror as a viewfinder whose radius of curvature is 2.0 m.  A maruti car is coming behind the truck at a distance of 10 m. What will be the position of the image of the car and size of the image of the car when observed by the driver of the truck through the convex mirror? Answer: Calculate the position of an image of an object placed 30 cm away from a concave lens of focal length 15 cm. Hence, both mirror and lens are concave. In this case, the image is formed at infinity, the nature of image is real, inverted and very much enlarged in size. The S.I. Answer: Answer: Question 3. The angle of incidence in the denser medium must be greater than the critical angle for that particular medium. Convex mirror. Save my name, email, and website in this browser for the next time I comment. unit of the power of a lens is ‘diopter’, which is denoted by the letter D. One dioptre is the power of a lens whose focal length is one metre. What possible phenomenon can happen when light falls on a surface? The phenomenon of mirage is produced by the total internal reflection of light which takes place when light passes from optically denser cold air to optically rarer hot air in the atmosphere. Convex mirrors are used as rear-view (wing) mirrors in vehicles. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share … Question 30. The ratio of sine of angle of incidence to the sine of angle of refraction is a Answer: Answer: The angle of reflection is 0°. The is Snell’s law of refraction. A stick partly immesed in water appears to be bent at the water surface. If medium around prism is rarer in comparison to the prism then ray of light after refraction bends towards the normal. You are provided with two lenses of focal length 20 cm and 40 cm respectively. State whether the image formed is erect or inverted. Answer: Using lens formula What type of image is formed: Why is it printed this way?. (b) Refraction of Light through a Prism. A concave mirror produces a magnified image when the object is placed in front of the mirror: Question 12. Relative refractive index of glass with respect to water would be= absolute refractive index of glass/absolute refractive index of water=1.5/1.333 lol. Also calculate the magnifying power of the lens. Analyse this value and state the Given: ν = + 18 cm. Since ν is positive, therefore image is formed behind the mirror at a distance of 50 cm from the mirror. Answer: Answer: 1. That is the ray passing through the centre of curvature is incident normally to the mirror. Question 36. Answer: Question 7. The image is real, inverted and equal in size with the object. Object height, h = + 2 cm The image of an object formed by a convex lens is 3 times of object on screen. A real image is formed at a distance of 75 cm from the mirror. Question 3. Answer: Which mirror-convex or concave has a larger field of view? h1 3 + 4 cm f = -10 cm u = -15 cm v = ? Draw the ray diagram. Calculate the focal length of the mirror and the size of the image. Question 31. Calculate the focal length of the mirror and linear magnification: Question 10. State any one reason. Given: P = + 2D, f = ? Answer: When a ray of light travels from one medium to another, its speed changes and this change in speed of light causes the bending of light (refraction of light). The mirage is seen in deserts. The angle between the refracted ray and the normal at the point of incidence is called angle of refraction. Answer: An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. For a particular angle of incidence, angle of deviation is least. Also mark the angle of incidence (∠i) and the angle of reflection (∠r) on the diagram. A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. If we go from material 1 with refractive index (n1) into material 2 with refractive index (n2). In this case, the image is formed at 2F on the right hand side of the lens. (c) Concave lens (i) in a plane mirror, and Given: u = – 20 cm, f = + 12 cm, h = 3 cm, ν =? It means the light ray goes straight from one medium to another. Since m is negative and greater than 1, the image is real, inverted and larger than the object. The image of an object is formed on the object itself placed at 36 cm from the pole on the principal axis of a concave mirror. The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane. We know that glass is a denser medium than water. Question 8. A pencil when dipped in water in a glass tumbler, appears to be bent at the interface of air and water. Question 14. Convex mirror: A spherical mirror whose reflecting surface is curved outwards, is called a convex mirror. Define the term angle of incidence. Question 19. What will happen to a ray of light when it falls normally on a surface? Answer: Speed of light in water Speed of light in water = 2.25 × 108 m/s. The image is real, inverted and 3 cm in size. Answer: Find the nature, position and height of the image. What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is + 3? ∴ Lens is concave. Question 25. Question 5. List four characteristics of the image formed by the mirror… Question 6. The Mirage: On a hot summer day, a traveller in a desert region often sees a water lake with the trees and sky reflected in it, a short distance ahead of him. This law is also known as Snell’s law of refraction. A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Why does a convex mirror is said to have a virtual principal focus? A very small head: Convex mirror A fat body: Concave mirror, and When a pencil is partly immersed in water, it appears to be bent at the interface of air and water. (ii) real image. Bottom of a tank or a pond containing water appears to be raised due to refraction. Question 10. Thus portion of stick under water appears to be P raised and bent at point B. Answer: During the day time, sky appear blue. Here, ∠MON = ∠MOL + ∠LON = θ Question 14. Image is real and inverted. Object is placed normal to the principle axis of the lens. For air, water and benzene. For a single mode optical fiber having a step-index refractive index profile, the. So, we see that prism deviates light from its path. Given: Object height, ho= 2 cm, Image height, he = -3 cm, Object distance, u = -32 cm State one advantage of using combination of lenses in optical instruments instead of a single lens. (iii) Divergent rays from a light source? ∠LON = ∠FOC = 25° (vetically oppsite angles) Answer: (i) Parallel rays, Optical fibres, which transmit many telephonic messages at the same time. Question 16. In the fig. Question 17. Question 27. Focal length, f = ? If light source is at infinity then after refraction through the lens they would converge at the focus Why does a ray of light bend when it travels from one medium into another? Answer: Show it diagrammatically. ∴ Focal length of the combiantion of lenses is given by Focal length, f = – 10 cm Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it. Answer: Question 4. No. Find the focal length of the mirror and the position where the image is formed? Answer: Question 15. Your IP: 142.11.192.169 The use of a combination of lenses increases the magnification and sharpness of the image. Given that: C = 3.0 × 108 m/s, n = \(\frac{4}{3}\), ν = ? The refractive index of the medium nm is given by If light source is between first focus and lens, then after refraction divergent rays are formed.

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