A ray of light travelling in air goes into water. When a ray of light travelling in glass enters into water obliquely: a it is refracted towards the normal b it is not refracted at all c it goes along the normal d it is refracted away from the normal. A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block.

Presentation on theme: "Ch. 17 Reflection and Refraction"— Presentation transcript:

The ray of light: a is refracted towards the normal b is refracted away from the normal c does not get refracted d is reflected along the same path. How is the reflection of light ray from a plane mirror different from the refraction of light ray as it enters a block of glass?

Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:. Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?

What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction? Refractive indices of carbon disulphide and ethyl alcohol are 1. Which is optically denser? The refractive index of diamond is 2. What is the meaning of this statement in relation to the speed of light? If the refractive index for light going from air to diamond be 2. Fill in the following blank with a suitable word: When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the Give three examples of materials that refract light rays.

What happens to the speed of light rays when they enter these materials? Define Snell's law of refraction. If the angle of refraction be The speed of light in vacuum and in two different glasses is given in the table below:. The speed of light in water is 2. Light enters from air into diamond which has a refractive index of 2. Calculate the speed of light in diamond. The speed of light in air is 3. State and explain the laws of refraction of light with the help of a labelled diagram.

Lakhmir Singh solutions for Class 10 Science chapter 5 - Refraction of Light

Calculate the refractive index of water. The speed of light is the maximum in the substance:. When the light rays pass from air into these materials, they refract the maximum in: a material A b material B c material C d material D. The speed of light in substance X is 1. The refractive index of this substance will be:. The refractive index of water is: a 1. The refractive index of air with respect to water will be: a 1. Refractive indices of water, sulphuric acid, glass and carbon disulphide are 1. The refractive index of glass with respect to water will be: a 1.

Use this table to give an example of: i a medium pair so that light speeds up when it goes from one of these medium to another. Name the lens which can concentrate sun's rays to a point and burn a hole in a piece of paper. Give the usual name for the following: A point inside a lens through which the light passes undeviated. What is the height of the image formed? Where should an object be placed in front of a convex lens so as to obtain its virtual, erect and magnified image? Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?

If an object is at a considerable distance or infinity in front of a convex lens, where is the image formed? Draw the given diagram in your answer book and complete it for the path of a ray of light after passing through the lens. What type of lens would you use as a magnifying glass? Distinguish between a convex lens and concave lens. Which of the two is a converging lens : convex lens of concave lens? Draw a ray diagram to show the formation of a real magnified image by a convex lens. In your sketch the position of object and image with respect to the principal focus of lens should be shown clearly.

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Give two characteristics of the image so formed. Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed in front of a convex lens between focus and optical centre. State three characteristics of the image formed.

Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed. Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity considerable distance in front of a convex lens.

State three characteristics of the image so formed. What type of lens is shown in the diagram on the right? What will happen to the parallel rays of light? Show by completing the ray diagram. Draw a diagram to show how a converging lens held close to the eye acts as a magnifying glass. Why is it usual to choose a lens of short focal length for this purpose rather than one of long focal length?

With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram. With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays.

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Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:. Which of the above two cases shows the use of convex lens as a magnifying glass?

Give reasons for your choice. An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.

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What is the effect on the size and position of the image of moving the object i towards the lens, and ii away from the lens? Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly. Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively.

Which one would you choose as a magnifying glass and why? A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass? A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces: a a convergent beam of light b a divergent beam of light c a parallel beam of light d a patch of coloured light.

An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is: a upright and magnified b inverted and magnified c inverted and diminished d upright and diminished. Which of the following statements correctly describes its image?