Question 1 :
The path of a beam of light is invisible in which solution?
Question 2 :
At sun rise of sunset, the sun looks more red than at mid-day because
Question 4 :
The spectrum, in which the colours are separated using a narrow source of light, is called:
Question 5 :
Braille writer slate and stylus is a type of resource for blind people that is called tactual aid
Question 7 :
A defect of vision caused due to excessive curvature of the cornea is:
Question 12 :
By which optical phenomena the splitting of white light into seven constituent colours occur?<br>
Question 14 :
The path of beam of light becomes _____ in a colloidal solution.
Question 15 :
Why do high rise buildings have a red light on the top of the building?
Question 18 :
State whether true or false :Myopia is caused due to the high converging power of the eye lens.
Question 21 :
The color of scattered light depends on ____ of the scattering particles.
Question 22 :
Intensity of light ray in a directionafter scattering by small particles (smaller than wavelength):
Question 23 :
Which of the following quantities changes during the process of scattering?
Question 24 :
The path of a beam of light is invisible in which solution?
Question 25 :
When white light is passed through two consecutive prisms, the resultant will be:
Question 27 :
Some stars appear red in colour and some blue in colour. Which one of the statements is true?<br>
Question 31 :
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?<br/>
Question 32 :
The sun appears red at the time of sun-rise and sun-set. This is because:
Question 33 :
Which of the following lens is used to minimise hypermetropia ?
Question 34 :
During dispersion through prism, red light travels fastest and violet travels slowest of all the seven colours. As a result:
Question 35 :
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 39 :
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:<br/>
Question 40 :
As the thickness of the atmosphere increases colour of scattered light is found in ________order.
Question 42 :
A person while reading a newspaper keeps it at a distance of $40$ cm, then he suffers from which of the following defects?
Question 43 :
The least distance of distinct vision for a defective eye is $75$ cm. What should be the focal length of the lens which will be used to read a book clearly at $25$ cm?
Question 46 :
The split of white light into its constituent colours, by a triangular prism, is known as:
Question 47 :
A disease, in which eye lens become cloudy and the opaque lens is removed and a new artificial lens is inserted, is :
Question 50 :
What are the colours of the Sun observed most during sunrise/sunset and noon? <br/>