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Compound Microscope

Compound microscope: It is an optical device used to see highly magnified image of tiny objects. Construction: It consist of two convex lenses of short focal length arranged co-axial at the free end of tube, at a suitable fixed distance. Objective: It is a convex lens of very short focal length and small aperture, kept […]

How to connect LCR circuit in series combination

LCR circuit: Suppose a resistance R. an inductance L and a capacitance C are connected in series to a source of alternating emf peak value of Where emf of alternating current Let I be the current in the series circuit at any instant. Then voltage will be differ due to R, L and C. Potential […]

Types of Force: Gravitational, Electric, Frictional, Viscous drag and Upthrust

Force may be described as a pull or a push that causes a body to accelerate or change the velocity of the body                                                       Or Force is defined as rate of change of momentum. It is a vector quantity. S.I. unit – Newton. All the force in universe are basis on for fundamental interactions. 1. […]

Derivation of Newton’s Equation

Derivation of Newton’s Equation Kinematic Equations for uniformly accelerated motion along straight line (i) Velocity time equation –  (ii) Displacement time equation –  (iii)Velocity displacement equation –  (iv)Displacement in nth second –  Consider a body of mass m having initial velocity u and after time t its final velocity becomes due to uniform acceleration. We […]

What Would Happen, If the sun were Made of Bananas!

The sun is hot, it is because its enormous weight creates vast gravity putting its core under colossal pressure, just as a bicycle pump gets warm when you pump it, the pump increases the temperature. Enormous pressure leads to enormous temperature. If instead of hydrogen, you get a billion billion billion tons of bananas and […]

Thermal Power Plant

A Power plant in which the heat required to make steam to drive turbines (to make electricity) is obtained by burning fuels (coal, oil or gas) is called thermal Power plant. Coal (fuel oil or natural gas) is burned in a furnance F to produce heat. This heat boils the water in boiler B to […]


A magnet is an object which attracts pieces of iron, steel, nickel and cobalt. One of the most common magnets is the bar magnet. A bar magnet is a long, rectangular bar of uniform cross section which attracts pieces of iron, steel, nickel and cobalt. Properties of Magnet A magnet has two poles near its […]


A magnetic field is described by drawing the magnetic field lines. The magnetic field lines are the lines drawn in a magnetic field along which a north magnetic pole would move. The magnetic field lines are also known as magnetic lines of force. The direction of magnetic field line is the direction of force on […]


The reciprocal of the combined resistance of a number of resistance connected in parallel is equal to the sum of the reciprocal of all the individual resistances. For ex. If no. of resistances are connected in parallel then their combined resistance R is given by formula When a number of resistances are connected in parallel […]


  Case (1): When object is placed at infinity Case (2): When object is placed anywhere between infinity and the optical centre of the concave lens.