Question 1 :
The sun appears red at the time of sun-rise and sun-set. This is because:
Question 3 :
If the image of distant objects is formed in front of the retina, the defect of vision may be
Question 4 :
The bluish colour of water in deep sea is due to:<br/>
Question 7 :
The angle between the two refracting surface of a prism is called angle of :<br/>
Question 8 :
The path of a beam of light is invisible in which solution?
Question 9 :
Braille writer slate and stylus is a type of resource for blind people that is called tactual aid
Question 10 :
Which of the following quantities changes during the process of scattering?
Question 11 :
In a beaker containing colloidal solution of sodium thiosulphate and a drop of con. sulphuric acid, light observed from side of beaker is:
Question 13 :
Assertion: By roughening the surface of a glass sheet its transparency can be reduced. <br>Reason: Glass sheet with rough surface absorbs more light.
Question 14 :
Assertion: Incoming light reflected by earth is partially polarized.
Reason: Atmospheric particle polarize the light.
Question 15 :
Larger particles scatter light at the ____ end of the spectrum the least. <br/>
Question 16 :
When is the direction of scattered light independent of the wavelength?
Question 18 :
At sun rise or at sun set the sun appears to be reddish while at mid day it looks white. This is because
Question 21 :
Two point white dots are 1 mm apart on a black paper. They are viewed by eye of diameter $3\ mm $.<br/>Approximately, what is the maximum distance at which these dots can be resolved by the eye?<br/>[ take wavelength of light >500nm]
Question 22 :
When the light rays converge at a point in front of the retina and then divert to form a blurred image on it, the defect is known as<br>
Question 23 :
A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed<br>
Question 24 :
Myopia or near sightedness is a defect of eyes in which<br>
Question 25 :
The process of re-emission of absorbed light in all directions with different intensities by the atom or molecule is called ____________.
