File Name: refraction of light questions and answers .zip
A beam of rays, parallel to the principal axis, is incident on a convex mirror. Show diagrammatically, the path of these rays after reflection from the mirror. Find the power of a concave lens of focal length 2 m? With respect to air the refractive index of ice is 1. Calculate the refractive index of rock salt with respect to ice? A concave mirror produces three times magnified enlarged real image of an object 10 cm in front of it.
Where is the image located? Three mirrors, one plane, one concave and one convex are lying on the table. How can a person identify them without touching them or using any other apparatus or device?
Plane mirror produces the image of same size. Concave mirror produced the magnified image while the convex mirror will produce a diminished image. Obtain the formula for the focal length of a lens in terms of object distance u and magnification m Ans. In what S. I unit is the power of lens stated?
A convex lens has a focal length of 50 cm. Light enters from air into diamond which has a refractive index of 2. Calculate the speed of light in diamond. Light is incident at an angle of i ii , on the same face of a given rectangular slab.
Obtain the relation between these two angles. Why do we prefer a convex mirror as a rear view mirror in vehicles? Convex mirror is preferred as rearview mirror is vehicles because it always forms virtual erect and diminished image. If also covers the wider field of view. A doctor has prescribed a corrective lens of power 1. Find the focal length of this lens.
Is the prescribed lens diverging or converging. Positive sign means it is a converging lens. Define the principle focus of a concave mirror.
Principal focus of a concave mirror is the point on its principal axis, where light rays coming parallel to principal axis actually converge after reflection from mirror. The radius of curvature of a spherical mirror is 20 cm. Name a mirror that can give an erect and enlarged image of an object.
Only a concave mirror can give a erect and enlarged image of an object. Why do we prefer a convex mirror as a rear-view mirror in vehicles? We prefer a convex mirror as a rear-view mirror in vehicles because a convex mirror gives an erect and diminished image. As a result, convex mirror help the driver to have much wider field view.
Find the focal length of a convex mirror whose radius of curvature is 32 cm. A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. A ray of light traveling in air enters obliquely into water. Does the light ray bend towards or away from the normal?
The light bends towards the normal on entry into water. It is due to the fact that as compared to air, the water is optically denser medium. Find out, from Table Also, find the medium with lowest optical density.
As per table, diamond has highest optical density 2. Medium with lowest optical density is air 1. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in table As the refractive index of water is least out of three substances. Hence speed of light is maximum in water. So, light travels fastest in water.
The refractive index of diamond is 2. What is the meaning of this statement? It means that speed of light in diamond is 2. Absolute refractive Index of some of material is tabulated below i In which of these does light travel fastest and why? A rod of length 10 cm lies along the principal axis of a concave mirror of 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of image? Focal length of lens 1 is 20 cm and of 2 is — 10 cm.
Calculate i Total Power of combination ii What is the nature of combination. A fish under water is viewing obliquely a fisherman standing on the bank of lake. Does the man look taller or shorter? As light travels from rarer to denser medium, it bends towards normal and appears to come from greater height. Therefore, to fish under water man looks taller.
Identify the type of lens or mirror placed at XV where 0 is object and I is image. Convex lens when object is placed between pole and focus.
An object is placed at a distance of 50 cm from a convex minor. State two characteristics of the image formed. Write two uses of concave mirror. An object 1 cm high produces a real image 1. Calculate the position of the image.
Find the power of a concave lens of focal length 2m. Which phenomenon occurs when light falls on a highly polished surface b a transparent medium? What will happen to a ray of light when it falls normally on a surface? No bending of light ray occurs. It means light rays goes straight from one medium to another. What is absolute refractive index? When first medium is taken as vaccum, the refractive index of second medium is called as absolute refractive index. If refractive index of glass is 1.
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An object is placed at a distance of 0. The distance between the object and image will be a 0. For a real object, which of the following can produce a real image? Answer: b Explanation: b Only concave mirror can produces a real image for the any position of object between its focus and infinity. Which of the following mirror is used by a dentist to examine a small cavity? Answer: c Explanation: c Concave mirror forms erect and enlarged image when held close to the cavity. An object at a distance of 30 cm from a concave mirror gets its image at the same point.
Light rays travel in different mediums at different speeds. This is the highest speed possible in physics. One of the most important parameters that measures optical properties of a medium is the index of refraction. The refractive index measure the optical density of a given material. A material with higher refractive is more optically dense than a material with lower refractive index. Example 1 What is the index of refraction in a medium where the speed of light is 1.
Download all answers in PDF file format or download Offline apps to use all the contents offline without internet. So, 10th Science chapter 10 question answers are useful for UP Board students also. Properties of images formed by a plane mirrors: i The image formed by a plane mirror is virtual and erect. Properties of the image formed by a convex mirror: i This image is always virtual and erect. Laws of refraction of light: The refraction of light obeys the following two laws: First law: The incident ray, the refracted ray and normal to the surface of separation at the point of incidence, all lie in the same plane. Second law: The ratio of the sine of the angle of incidence and the sine of the angle of refraction is constant for a given pair of media. The ratio n2 is called refractive index of the second medium with respect to the first medium.
List four characteristics of the images formed by plane mirrors. CBSE 2. Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed parallel to the principal axis of a convex mirror. Mark on it the angle of incident and the angle of reflection CBSE 3. A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.
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