discover everything from nature.....

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knowledge is power

develop scientific approach...

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learning is continuous process....


combine experiments and theory....

Friday, 21 July 2017


Mirror can reflect the light due to its non transparency property...the surface where light reflects is called reflecting surface.
1. Plane mirrors
2. Spherical mirrors

principles of reflection:
1. The angle of incidence is equal to the angle of reflection

2. Incident ray, reflected ray and Normal lie in the same plane. They are coplanar.

....surender, SA Phy.

Wednesday, 19 April 2017

learn here


Rapid Learning Center is the leading provider of rapid e-learning solutions in chemistry, biology, physics, math, statistics and other core courses at high school, college levels and beyond. We also offer test prep rapid learning packages on MCAT, DAT, OAT, PCAT, Pre-Nursing, AP, SAT and other standard tests, with more to come.

Our Rapid Learning Team is a team of talents including university professors, high school educators, learning specialists and instructional designers.

Topic Review on "Solving Physics Problems":
5 step problem solving strategy:
  • Step 1: Identify what’s being given
  • Step 2: Clarify what’s being asked.
                 If necessary, rephrase the question
  • Step 3: Select a strategy
                 Trial & error, search, deductive reasoning, knowledge-based, working backwards
  • Step 4: Solve using the strategy
  • Step 5: Review the answer
KUDOS method for solving work problems:
  • K = Known
  • U = Unknown
  • D = Definition
  • O = Output
  • S = Substantiation
Physics exam prep tips:
  • Stay ahead of the game
  • Make a cheat-sheet
  • Know the format of the test and information that’s fair game
  • Make a mock exam
  • Attend the review session
  • Get help early
Exam taking tips:
  • Arrive early and prepared
  • Listen & Read instructions carefully
  • Memory dump first
  • Skim the test and form a plan
  • Answer questions sequentially
  • Apply the guessing rule
Multiple-choice tips:
  • Scan all the choices
  • Avoid word confusion
  • Beware of absolutes
Essay tips:
  • Understand the question
  • Answer the whole question and only the question
  • Watch your time 
Free-Response tips:
  • Show partial work
  • Don’t forget units
  • Don’t be fooled by blank space

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Joan Forder, Ph.D.
John Delmastro, M.D.
Dan Kiel, Ph.D.
Beverly Hamilton, Ph.D. 

use the opportunity to learn from great professors...


Sunday, 16 April 2017

types of objects and images


Ray optics primarily deals with determining the position and nature of the image formed when an object is placed in front of an optical element.


An object is a source of light rays that are incident on an optical element.  An object may be a point or an extended object.  Since extended objects can be modeled as a collection of points, we only need to study point objects.


An object is real if two or more incident rays actually emanate or seen to emanate from a point.  The object is actually present.  Hence it is called a real object.


An object is said to be virtual when two incident rays seem to converge to that point.


An image is the point of convergence or apparent point of divergence of rays after they interact with a given optical element.  An object provides rays that will be incident on an optical element.  The optical element reflects or refracts the incident light rays which then meet at a point to form an image.


Real images are formed when the reflected or refracted rays actually meet or converge to a point.  A real object can be captured on a screen.


When light rays, after interacting with the optical element, do not meet at a point but appear to emanate from a point, then the virtual images are formed.

Wednesday, 5 April 2017


What Causes Foot Pain? How do Barefoot Science insoles fix feet and eliminate foot, back, and body pain? Let’s start with understanding foot pain… Is foot pain caused by overuse? Nope My shoes protect my feet from injury while I’m in motion. Not exactly By cushioning and stabilizing my painful feet, I can eliminate my pain. WRONG At Barefoot Science, we have spent over 15 years researching foot function and the causes of foot pain to develop our revolutionary foot care technology. And what we’ve found is that the pain in your feet starts with… …Your Footwear! Almost every step we walk in today’s world is taken wearing some kind of footwear. We begin to wear shoes before we can even walk. But walking is the best means we have to exercise the 20 muscles in each of our feet. Because we wear footwear of some sort as a matter of course in the modern world, we take almost all of our foot exercising opportunities – each of the thousands of steps we take each day – with our foot muscles immobilized, unable to properly flex. And the more steps you take, the more your foot muscles fall into disuse and ultimately weaken. When your foot muscles and ligaments fall out of alignment, a chain reaction of misalignment is set off right up your legs and spinal cord. This is why we find so many people who spend time on their feet at work – nurses, office workers, construction workers – and other active “steppers” – joggers, cyclists, golfers – complaining about pain in their feet, knees, hips, and back. Over time, denying your feet the benefits of walking barefoot by wearing shoes can compound into an alignment problem that may not only be responsible for your sore feet, but also your chronic lower back pain. In fact, an estimated eight out of ten people in the U.S. have gait problems that cause sore feet, aching backs and hips, and pains in the leg and neck. So, if you’ve been wearing orthotics for all these years, why aren’t you better? For many people, foot pain becomes a chronic problem. People for whom being on their feet is a job requirement have no choice but to search for a solution. And for over 100 years, the standard medical approach to treating foot pain has been to custom brace the foot with an orthotic.An orthotic is defined as a brace for a dysfunctional joint or muscle. But based on what we already know about foot muscle weakness leading to misalignment and ultimately causing foot pain, the concept of bracing the foot just keeps the same weak foot muscles in a constant state of weakness – without any hope of improvement. Once you put an orthotic in your shoe and permanently brace it, you will never rehabilitate it because your foot muscles will have even less opportunity for exercise than before. So in many ways, the modern approach to foot pain – the orthotic – starts a vicious cycle of muscle weakness and ongoing pain. What do our feet want? Our feet want to be bare. Our foot muscles need to experience a range of motion not possible while walking wearing shoes. The soles of our feet need to experience physical stimulation to send signals through the nerve endings and muscles of the foot. We want to feel the earth – we don’t want sensory insulation We want as much freedom or range of motion as we can get for our foot We certainly do not want to brace, cushion or support our feet To achieve the barefoot effect for your feet in our “shoes required” world, you need Barefoot Science. How our insoles rid you of your pain Barefoot Science is a foot strengthening system. Similar to walking in sand, our insoles cause the 20 muscles in each of your feet to fire in a way that makes them stronger. As with any muscle, the more they are exercised, the stronger they get. Why do you need strong feet? Because your feet are your foundation and strong, aligned feet are pain-free feet! Not only will your feet benefit, but the rest of your body, including your heels, knees, shoulders, and back will be aligned and pain free as well. Barefoot Science’s insoles correct the cause of your pain versus just accommodating it as do other insoles and orthotics. “How does the multi-level strengthening system work?” Wearers simply switch out the patented foot-stimulating tab that fits neatly into the arch of the insole until they progress from stage 1 through 5 (or 7 with our special therapeutic model). How do you know when to move up a level? Your foot will tell you! When the muscles in your foot have gotten strong enough for the next level, you will notice that you can’t feel the insole in your shoe anymore and that’s the signal that it’s time to move up. How long does it take? We usually recommend about one week between levels.We’ve sold over a million insoles to people the world over; it’s time you experienced what pain-free living is all about! And, with Barefoot Science’s 100% satisfaction guarantee, there is no risk involved. Love them or we’ll refund your money. Here’s what a few of our satisfied customers have been kind enough to say about our insoles. Barefoot Science Therapeutic Foot Care Insoles Experts are saying... Barefoot Science insoles are the best I have ever come across including a $500 pair I have from a foot doctor. I think I originally saw them on an infomercial either on line or on TV. I have them in every pair of shoes and sneakers I own. They have improved my overall arch health dramatically since I began using them. They also last a long time as you can see from the time I placed my last order for 5 in 2010. Hopefully the company continues offering this great product in the future. Thanks again for your help. — William Westberg, Specialty Division Account Executive, Division of LFUSA Customers are saying... First and foremost, I am absolutely thrilled, and I mean thrilled, with your product. My problem foot has not felt this good in 25 years, and I am just astonished that your insoles could accomplish so easily what a zillion visits to 'experts' and a zillion dollars for custom orthotics could not. I admit to being a little skeptical when my wife first came across your product online (I am not usually persuaded by TV infomercial type of stuff) but the many online comments (mostly very positive) about the insoles and your own very prompt and comprehensive responses to my inquiries sold me initially, and the rest is history. My only fears going forward are either you change the design or you choose another line of work and your business closes!! Hopefully neither will happen and you enjoy continued success and prosperity.

Saturday, 1 April 2017

video-two digit multiplication

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mathematics videos


1. two digit multiplication

Tuesday, 28 March 2017


Monday, 27 March 2017