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प्रश्न
Choose and write the correct option.
If we gradually increase the angle of incidence of a ray of light passing through prism then …..
पर्याय
Angle of deviation goes on decreasing.
Angle of deviation decreases but after certain value of incident angle, deviation angle increases
Angle of deviation goes on increasing.
Angle of deviation increases but after certain value of incident angle deviation angle decreases.
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उत्तर
Angle of deviation decreases but after certain value of
incident angle, deviation angle increases.
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संबंधित प्रश्न
A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?
Which type of reflection of light leads to the formation of images?
The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?
State the uses of plane mirrors.
Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:
(a) Incident ray
(b) Point of incidence
(c) Normal
(d) Reflected ray
(e) Angle of incidence
(f) Angle of reflection
A man stands 10 m in front of a large plane mirror. How far must the walk before he is 5 m away from his image?
A man sits in an optician's chair looking into plane mirror which is 2 m away from him and views the image of a chart which faces the mirror and is 50 cm behind his head. How far away from his eyes does the chart appear to be?
A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.
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?
Which phenomenon of light makes the water to appear shallower than it really is?
State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.
Fill in the following blank with suitable word:
Light bends when is passes from water into air. We say that it is ............
With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.
How does the light have to enter the glass:
to produce a large amount of bending?
How does the light have to enter the glass:
for no refraction to happen?
The depth of a pond when seen from above appears to be less.
Image is formed by a mirror due to refraction of light.
Air is optically .......... than glass.
What do you understand by refraction of light?
Draw a diagram showing the refraction of a light ray from water to glass. Label on it the incident ray, the angle of incidence (/), and the angle of refraction (r)
Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror, and (b) a convex mirror
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?
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.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s−1.
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.
The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.
Explain how the formation of a rainbow occurs.
Light changes its direction when going from one transparent medium to another transparent medium. This is called _______.
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
The refractive index of a transparent medium is always greater than ______.
How does the light travel?
Light travels fastest in a vacuum. Why?
The bending of light as it passes from one medium to another is called ______.
Light is refracted or bent while going from one medium to another because of its ______ changes.
Under what circumstances there won’t be any refraction of light when it enters from one medium to another?
How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.
