# all formulas of physics class 10 human eye

It bends towards the normal. Why planets do not twinkle ? 39. Astigmatism can be corrected with lenses having different curvatures in two mutually perpendicular directions i.e., cylindrical lens. People who have been using spectacles or those operated for cataract can also donate eyes. Prism: A prism has two triangular bases and three, Angle of Prism: Angle between two lateral faces is. Composition of white light: White light consists of seven colours i.e., violet, indigo, blue, green, yellow, orange and red. So basically, light rays that are deflected from or by distant objects land on the retina after they pass through various mediums like the cornea, crystalline lens, aqueous humor, the lens, and vitreous humor. Class 10 Science The Human Eye and the Colourful World – Get here the Notes for Class 10 Science The Human Eye and the Colourful World. (i) decrease in flexibility of eye lens. Due to decrease in power (or increase in focal length) of eye lens. Presbyopia: It is a kind of defect in human eye which occurs due to ageing. Got to know a lot of facts about human eyes, and I am really thankful to BYJU’S for this. 15. It helps us in visualizing objects and also helps us in light perception, color, and depth perception. All physics formulas are in PDF format and are available free of charge; this makes it easily accessible to students. Least cfistance of distinct vision: The minimum distance upto which an eye can see clearly is called the legist distance of distinct vision ; it is normally denoted by D. The least distance of distinct vision is equal to the distance between the eye and its near point. Correction: Since a convex lens has the ability to converge incoming rays, it can be used to correct this defect of vision, as you already have seen in the animation. Chapter wise Physics Quiz . 7. (ii) shortening of eyeball. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings. 26. The human eye structure and function makes it easy to distinguish the objects based on colour, size and other parameters . 3. The distance between far point and near point of the eye is called range of vision of the eye. Persistence of Vision: It is the time for which the sensation of an object continue in the eye. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrop. Transmits electrical signals to the brain. People suffering from diabetes, hypertension, asthma or any other non- communicable diseases can donate eyes. Colour of Sunrise and Sunset: While sunset and sunrise, the colour of the sun and its surroundihg appear red. Recombination of white light: Newton found that when an inverted prism is placed in the path of dispersed light then after passing through the prism, they recombine to form white light. Hypermetropia (Long-sightedness): It is a kind of defect in the human eye due to which, a person can see distant objects properly but cannot see the nearby objects clearly. Issac Newton: He was the first, who obtained spectrum of sunlight by using glass prism. The various colours seen are Violet, Indigo, Blue, Green, Yellow, Orange and Red. 8. A thin membrane which provides 67% of the eye’s focusing power. 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For a normal eye, the far point is infinity. It contains rods and cones. Having different refractive indexes is what bends the rays to form an image. The human eye has the following parts : 5. person’s far point Focal length, f =? Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Unlike a rectangular slab, the side of a glass prism are inclined at an angle called the angle of prism. CHAPTER 11:The Human Eye And The Colourful World. 11.2 Defects of Vision And Their Correction. Distant star act as point source of light. The successive impressions of images on the screen appear to merge smoothly into one another to give us the feeling of moving images. Farpoint: The farthest point upto which a short sighted eye can see clearly is called the far point of the eye. (i) decrease in the power of eye lens i.e., increase in focal length of eye lens. The image is allowed to format the retina by using a concave lens of suitable power as shown in the given figure. So no vision is possible at that point and is known as a blind spot. Apparent flattering of the Sun’s disc at sunset and sunrise is due to atmospheric refraction. Here we have given NCERT Class 10 Science Notes Chapter 11 Human Eye and Colourful World. Refraction of light through a prism, Dispersion of white light by a glass prism, Composition of white light, Recombination of spectrum colours, Rainbow. Object distance, u = -25 cm, normal near point Therefore the total amount of light entering our eyes from all individual point source will nullify the twinkling effect. 19. (i) excessive curvature of the cornea. CBSE Class 10 Science Notes Chapter 11 Human Eye and Colourful World. Presbyopia is that defect of human eye, due to which an old person cannot read and write comfortably. We hope the given CBSE Class 10 Science Notes Chapter 11 Human Eye and Colourful World Pdf free download will help you. When white light is passed through a prism, we can see it split into the components that it is made of. Pupil: It is a hole in the middle of iris through which light enters the eye. Image distance, v = defective near point Refraction of light through a prism: When a ray of light is incident on a rectangular glass slab, after refracting through the slab, it gets displaced laterally. The cause of Hypermetropia is decrease in length of eyeball or increase In focal length of eye lens. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings. (a) When the light is bright: Iris contracts the pupil, so that less light enters the eye. 14. During sunset and sunrise, the sun is near to horizon, and therefore, the sunlight has to travel larger distance in atmosphere. Human Eye: working of human eye, Persistence of vision, Power of accommodation of human eye, Defects of vision. It is remembered by the acronym VIBGYOR. By donating our eyes after we die, one pair of our eyes can give vision to two corneal blind people. The star appear higher than its actual position. Thus the duration of, day time will increase by 4 minutes. Correction: Since a concave lens has an ability to diverge incoming rays, it is used to correct this defect of vision. Covers the outer surface (visible part) of the eye. Well, to put it in simple terms, refraction is nothing but the change in direction of the rays of light as they pass between different mediums. An eye also consists of six muscles. Class 10 Physics Human Eye and Colourful World: Dispersion of White Light by a Glass Prism: Dispersion of White Light by a Glass Prism. The light of longer wavelength (red colour) reaches our eye. 30. Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. Distant star act like a point source of light. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, CBSE NotesCBSE Notes ScienceNCERT Solutions Science. from Rarer to denser. It is formed due to the dispersion of sunlight by the tiny water droplet, present in the atmosphere. Different colours move with same speed in air/vacuum. The light rays finally are received and focused on the retina. 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