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Defects of vision and correction

WHAT HAPPENS WHEN CILIARY MUSCLES CANNOT ACCOMMODATE EYE LENS? This happens when ciliary muscles become weak and cannot adjust the focal length of the eye lens. This may be due to ageing or some other reasons of lack of vitamins, etc When proper accommodation of eye lens is not done then it leads to defects of eye. We have mainly three defects of vision. They are: 1) MYOPIA (SHORT SIGHTEDNESS): this defect is due to failure of adjusting maximum focal length of eye lens to 2.5 cm when seeing the far objects. The people with this defect have far point (M). And beyond far point the objects are not seen because f max for these people will be less than 2.5 cm. So image forms in front of retina. So these people can see a blur image of far objects (beyond M). So these people can see the objects only between least distance of distinct vision (L) and far point (M). Far point: the extreme point from where an object appears clearly to a person with myopia is called f

Series and parallel connection of resistors

TYPES OF CONNECTIONS: Electric components can be connected in two ways SERIES: When negative terminal of first component is connected to positive terminal of second component, negative terminal of second component is connected to positive terminal of third component and so on, then the components are said to be connected in series. PARALLEL: when the positive terminals of all the components are connected to one end and the negative terminals of all the components are connected to another end, then the components are said to be connected in parallel. HOW TO FIND EQUIVALENT RESISTANCE OF COMBINATION OF RESISTORS CONNECTED IN SERIES AND PARALLEL? RESISTORS CONNECTED IN SERIES: In series connection of resistors there is only one path for the flow of current in the circuit. Hence, the current in the circuit is equal to i. But potential difference varies depending upon the resistance of a resistor. According to Ohm’s law, Potential difference across R 1 is , V 1 = iR 1 Potential dif

Human eye and its working

LEAST DISTANCE OF DISTINCT VISION (CLEAR VISION) Imagine that we don’t have any defect of vision, but can we see the object clearly at any distance in front of our eye? The answer is no. Because we know that we cannot see objects when they are very closer to our eye. So, a minimum distance is required in front of our eyes to see the objects clearly. “The minimum distance required between eye and the object, to see the object clearly” is called LEAST DISTANCE OF DISTINCT VISION. So how much is the required distance? This varies from person to person and also with age. At very young age below 10 years 7-8 cm of distance is enough to see objects clearly because at this age the muscles will be strong enough to bear the strain. And if you consider old age people, even they require about 1-2 metre to see the objects clearly even though they doesn’t have any defect of vision. So , on average for a healthy adult it requires a minimum of 25 cm in front of eye to see the o

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