Here are some critical Chapter 10 The Human Eye and the Colourful world Problems for Class 10 Science. These inquiries are intended to aid students in studying for and performing well on the CBSE Class 10 Science Examination 2023–24. Students can clear up their concerns and be ready for the exams by practising different types of questions. By answering these questions, you'll increase your confidence while also sharpening your problem-solving abilities
In Chapter 10 The Human Eye and the Colourful World you will study about The Human Eye, Defects of Vision and their Correction,Refraction of Light through a Prism, Dispersion of White Light by a Glass Prism, Atmospheric Refraction and Scattering of Light.
When a ray of light passes through a prism and undergoes refraction, the emergent ray takes a different path compared to the incident ray. The emergent ray bends at an angle to the direction of the incident ray.
At noon because the sun is overhead, the light is scattered the least and hence appears white. When it is overhead, it has less air to travel through and the scattering from dust and other particles is reduced if the distance to be travelled in air is reduced.
Though all the treatment for recovering from his eye problems did not help him out, I would suggest he opt for eye transplantation which would get his eyesight back to normal. In transplantation of the eye, the entire diseased eye cannot be replaced. Only the diseased cornea can be replaced by the donated cornea.
The clouds contain dust particles and water molecules of size bigger than the wavelength of visible light, so they scatter all colours of incident white light from the sun to the same extent and hence when the scattered light reaches our eyes, the clouds are seen white.
oswal.io offers a thorough set of questions for learning the topic in a better way if you're looking to further practise and improve your grasp of the concepts covered in the chapter.
Ans: White light coming from the sun has to travel more distance in the atmosphere before reaching the observer. During this, the scattering of all coloured lights except the light corresponding to red colour takes place and so, only the red coloured light reaches the observer. Therefore, the sun appears reddish at sunrise and sunset.
Ans: A normal eye is not able to see the objects placed closer than 25 cm clearly because the ciliary muscles of the eyes are unable to contract beyond a certain limit.
Ans: The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth’s atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.
Ans: The image is formed on the retina even on increasing the distance of an object from the eye. The eye lens becomes thinner and its focal length increases as the object is moved away from the eye.
Ans: Unlike stars, planets don’t twinkle. Stars are so distant that they appear as pinpoints of light in the night sky, even when viewed through a telescope. Since all the light is coming from a single point, its path is highly susceptible to atmospheric interference (i.e. their light is easily diffracted).