Question 2 :
A prism is a piece of transparent material having _____ triangular and _____ rectangular surfaces.
Question 3 :
When Astronauts fly at higher altitude, the sky appears dark because ;
Question 4 :
Why are red coloured lights are used in traffic signals to stop the vehicles?
Question 8 :
Assertion: A beam of white light gives a spectrum on passing through a hollow prism.
Reason: Speed of light outside the prism is different from the speed of light inside the prism.
Question 10 :
For the myopic eye, the far point is farther away than the normal.
Question 12 :
In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for:<br>
Question 13 :
As the thickness of the atmosphere increases colour of scattered light is found in ________order.
Question 15 :
Why astronauts see dark sky in space unlike blue sky on earth:
Question 16 :
At sun rise of sunset, the sun looks more red than at mid-day because
Question 17 :
Which of the following quantities changes during the process of scattering?
Question 18 :
Name the prism required for obtaining the spectrum of ultraviolet light:<br/>
Question 21 :
CV Raman got the Nobel Prize for his experiment on :
Question 23 :
The path of a beam of light is invisible in which solution?
Question 25 :
A person cannot see fundamental colours (red, blue, green). This defect is called:
Question 26 :
An astronaut in a spaceship the sky appears black due to:
Question 31 :
Suppose the vitreous humour of the eye dries off. Then what will be its effect on our eyes?
Question 32 :
What are the colours of the Sun observed most during sunrise/sunset and noon? <br/>
Question 33 :
Name the prism required for obtaining the spectrum of infra red radiation<br/>
Question 34 :
The path of a beam of light is invisible in which solution?
Question 36 :
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?<br/>
Question 37 :
The inability among the elderly to see nearby objects clearly because of the weaking of the ciliary muscles is called
Question 39 :
The phenomenon of scattering of light by fine particles is called _____ :<br/>
Question 40 :
Which of the following observations cannot be explained by Tyndall Effect?
Question 41 :
On passing white light through a glass prism. Whichcolour ray will deviate maximum towards its base?
Question 42 :
Which of the following lens is used to minimise hypermetropia ?
Question 43 :
The spectrum, in which the colours are separated using a narrow source of light, is called:
Question 46 :
In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for:<br>
Question 48 :
The path of beam of light becomes _____ in a colloidal solution.
Question 50 :
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?<br/>