You must have ride Roller coaster or ferris wheel in the amusement park. Its up and down and moving in the circle must have thrilled and fascinated you Today I would like to give a brief details about those machine and how you feel different in those rides
Q1. What is the difference between reflection and refraction?
Q2.Refraction is caused by
a. different wave speeds.
b. more than one reflection.
c. displaced images.
Q3. What will happen to ray of light when it travels from rarer medium to a denser medium ?
Q4. What is absolute refractive index ?
Q5. If refractive index of glass is 1.65, What is the speed of light in glass. ?
Question: Is it compulsory to appear in theory and practical papers in the compartment examination
Asnwer: In case the candidate has passed in the practical in the main examination, he/she is allowed to appear in the theory part only, and marks in the practical exam obtained at the main examination are carried forward and accounted for. In case a candidate has failed in the practical exam he/she shall have to appear in the theory and practical examination both irrespective of the fact that he/she has already cleared the theory examination
Date Sheet for CBSE 2014 for X class
Quick Summary of General Mechanics Definition,Formula,Units and Dimensions
Glossary of Mirror and Lenses
A plane mirror is a mirror with a planar reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.It always form virtual image
Concave or Converging Mirrors
A curved mirror that has its center farther away from you than its edges is called a concave mirror. A concave mirror tends to reflect parallel rays through a point called its focus – in other words a concave mirror converges light. Therefore concave mirrors are often referred to as converging mirrors. This converging effect makes sense if you imagine a concave mirror to be an array of small plane mirrors.You can demonstrate the converging of parallel light rays by a concave mirror quite dramatically for yourself. A relatively small concave mirror placed in the sun will gather enough light to ignite a small piece of paper quite quickly
Convex or Diverging Mirrors
One question has always fascinated the scientists ” When the universe began?” . Current Thinking believes that Universe began as a singularity in space and Time. The singularity is called as Big Bang. It is believed at this time everything was condensed into very small space. After that the Universe has been continuously expansion mode.
A Astronomer Edwin Hubble discovered in 1929 the rate of expansion of Universe i.e the rate at which the galaxies are receding from each other. That law is called Hubble Law. As per Law, if the two galaxies are at distance R,Their present relative velocity of separation is given by
We already know the statement of Ohm’s Law which is
“If the physical state of the conductor (Temperature and mechanical strain etc.) remains unchanged, then current flowing through a conductor is always directly proportional to the potential difference across the two ends of the conductor”