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प्रश्न
| Column I | Column II | Column III | |
| 1 | Dispersion | Long-sightedness | Twinkling of stars |
| 2 | Refraction | Splitting of white light into component colours | Convex lens |
| 3 | Hypermetropia | Change in the direction of the ray of light due to change in medium | Spectrum of seven colours |
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उत्तर
| Column I | Column II | Column III | |
| 1 | Dispersion | Splitting of white light into component colours | Spectrum of seven colours |
| 2 | Refraction | Change in the direction of the ray of light due to change in medium | Twinkling of stars |
| 3 | Hypermetropia | Long-sightedness | Convex lens |
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संबंधित प्रश्न
What is refraction of light?
Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
What is lateral inversion? Explain by giving a suitable example.
What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?
A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light?
Which type of reflection of light leads to the formation of images?
Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:
- Incident ray
- Point of incidence
- Normal
- Reflected ray
- Angle of incidence
- Angle of reflection
A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.
When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
As light rays pass from water into glass, are they refracted towards the normal or away from the normal?
State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.
What is meant by ‘refraction of light’?
Light travels more quickly through water than through glass.
If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal?
When a ray of light travelling in glass enters into water obliquely ______.
Water is optically denser than glass.
The depth of a pond when seen from above appears to be less.
Image is formed by a mirror due to refraction of light.
When a ray of light travels from water to air, it bends ............. the normal.
A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.
A ray of light A incident from air suffers partial reflection and refraction at the boundary of water.
- Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C.
- How are the angles of incidence i and refraction r related?
A small air bubble in a glass block when seen from above appears to be raised because of ______.
Fill in the blank and Explain the completed sentences.
The change in ______ of light rays while going from one medium to another is called refraction.
Choose and write the correct option.
If we gradually increase the angle of incidence of a ray of light passing through prism then …..
Define the principal focus of a concave mirror.
List four characteristics of the image formed by a concave lens of focal length 20 cm when the object is placed at a distance of 40 cm from its optical centre.
Due to _______ pencil looks bent in water, in the given experiment.
Identify the wrong figure from the following.
The refractive index of a transparent medium is always greater than ______.
Assertion and reasoning type
- Assertion: If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small
- Reason: Refractive index of the medium is inversely proportional to the velocity of the light
The angle of incidence for a ray of light having zero reflection angle is ______.
If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.
When light passes from one medium to another the ray gets bent. This property of light is called ______.
How does the light travel?
When a light ray passes from a denser medium to a rarer medium, it bends:
The absolute refractive index of a medium is given by:
A medium with a higher refractive index is:
