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प्रश्न
State two effects caused by the refraction of light.
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उत्तर
Refraction of light can cause following two effects:
1. An object placed under water appears to be raised.
2. A stick held obliquely and partly immersed in water appears to be bent at the water surface.
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संबंधित प्रश्न
What is the difference between regular reflection of light and diffuse reflection of light?
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
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Explain how to read the following message which was found on some blotting paper:
Name the phenomenon due to which a swimming pool appears less deep than it really is.
What is meant by 'refraction of light'? Draw a labelled ray diagram to show the refraction of light.
With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.
State two factors on which the lateral displacement of the emergent ray depends.
A ray of light when passes from glass to air, bends towards the normal.
When a ray of light travels from air to glass, it bends .......... the normal.
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?
We can see the sun even when it is little below the horizon because of ______.
The size of image of an object by a convex lens of focal length 20 cm is observed to be reduced to `1/3` rd of its size . Find the distance of the object from the optical centre of the lens .
Explain how the formation of a rainbow occurs.
Explain with diagrams how refraction of incident light takes place from
- rarer to denser medium
- denser to rarer medium
- normal to the surface separating the two media.
The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
The refractive index of a transparent medium is always greater than ______.
Why a pencil partly immersed in water appears to be bent at the water surface.
