हिंदी

Fill in the Blank:Very Fine Particles Mainly Scatter - Science and Technology 1

Advertisements
Advertisements

प्रश्न

Fill in the blank:

Very fine particles mainly scatter ………… colored light.

रिक्त स्थान भरें

उत्तर

Very fine particles mainly scatter blue colored light.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
2013-2014 (March)

APPEARS IN

संबंधित प्रश्न

Why can’t we see clearly through fog?


Show with the help of a diagram, how unpolarised light from Sun gets linearly polarised by scattering.


A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light


A convex lens is made of a material having refractive index
\[1 \cdot 2\] Both the surfaces of the lens are convex. If it is dipped into water (μ = 1.33), it will behave like 


A point object O is placed on the principal axis of a convex lens of focal length f = 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is


A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image.


A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.


A 1 cm object is placed perpendicular to the principal axis of a convex mirror of focal length 7.5 cm. Find its distance from the mirror if the image formed is 0.6 cm in size.


Locate the image of the point P as seen by the eye in the figure.


k transparent slabs are arranged one over another. The refractive indices of the slabs are μ1, μ2, μ3, ... μk and the thicknesses are t1 t2t3, ... tk. An object is seen through this combination with nearly perpendicular light. Find the equivalent refractive index of the system which will allow the image to be formed at the same place.


An optical fibre (μ = 1.72) is surrounded by a glass coating (μ = 1.50). Find the critical angle for total internal reflection at the fibre-glass interface.


Light is incident from glass (μ = 1.50) to water (μ = 1.33). Find the range of the angle of deviation for which there are two angles of incidence.


A point source is placed at a depth h below the surface of water (refractive index = μ). (a) Show that light escapes through a circular area on the water surface with its centre directly above the point source. (b) Find the angle subtended by a radius of the area on the source.


The diameter of the sun is 1.4 × 109 m and its distance from the earth is 1.5 × 1011 m. Find the radius of the image of the sun formed by a lens of focal length 20 cm.


Fill in the blank and rewrite the completed statement:

Very fine particles mainly scatter ______ light.


Answer the following question in detail.

State the conditions under which a rainbow can be seen.


Answer the following question in detail.

Explain the formation of a secondary rainbow. For which angular range with the horizontal is it visible?


Case study: Mirage in deserts 

To a distant observer, the light appears to be coming from somewhere below the ground. The observer naturally assumes that light is being reflected from the ground, say, by a pool of water near the tall object.

Such inverted images of distant tall objects cause an optical illusion to the observer. This phenomenon is called mirage. This type of mirage is especially common in hot deserts.

Based on the above facts, answer the following question:

Which of the following phenomena is prominently involved in the formation of mirage in deserts?


Case study: Mirage in deserts

To a distant observer, the light appears to be coming from somewhere below the ground. The observer naturally assumes that light is being reflected from the ground, say, by a pool of water near the tall object.

Such inverted images of distant tall objects cause an optical illusion to the observer. This phenomenon is called mirage. This type of mirage is especially common in hot deserts.

Based on the above facts, answer the following question :

In an optical fibre, if n1 and n2 are the refractive indices of the core and cladding, then which among the following, would be a correct equation? 


Between the primary and secondary rainbows, there is a dark band known as Alexandar’s dark band. This is because ______.

  1. light scattered into this region interfere destructively.
  2. there is no light scattered into this region.
  3. light is absorbed in this region.
  4. angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately 42° and 50°.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×