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The image formed by the lens will have following characteristics.

1. The image will be virtual and erect.

2. It will be a magnified image; this means that the size of the image will be larger than the size of the object.

3. The position of the image will be at the same side where the object is placed.

focal length of convex lens, f = +20cm

object distance, u = -10cm

use lens maker formula,

1/v - 1/u = 1/f

or, 1/v - 1/-10 = 1/20

or, 1/v = 1/20 + 1/-10

or, 1/v = -1/20 => v = -20

here it is clearly shown that, image is formed at the same side of lens 20cm from the pole of lens.

magnification, m = v/u = -20/-10 = 2,

magnification is greater than 1, so size of image is greater than size of object.

magnification is positive so, image is virtual and erect

so, four characteristics of image :

1. image is virtual

2. image is erect.

3. image is enlarged

4. image is formed at the same side of lens.

Concave mirror - Real or virtual image.Plane mirror - Virtual and same size image as object

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6)Image formed by a convexmirror is always virtual ,erect and smaller in size.7)An image formed by a concavelenscannot be obtainedon a screen.

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I don't know this answer sorry

width of the river d=4 miles

speed of water v=2 miles/h

ER. RAVI KUMAR ROY

minimum time only taken to cross the river when the speed of boat is parallel to the resultant speed of v and u(when u = speed of boat= 4miles/h)now ,the resultant speed w = √(v)2+(u)2 d = w t minimum time t = 4/2√5 = 2√5 h

For the stone that is dropped,

Initial velocity, u = 0

Distance covered, h = -100 m

Acceleration due to gravity, g = -10 ms-2

h= ut+1/2gt^2-100= 0-1/2*10*t^2t= 4.5 secondSo, the stone reach the ground in 4.5 s after it is dropped.

Now, at t = 0, the iron ball is thrown.

At, t = 2 s, the stone is dropped.

So, the stone reach the ground at t = 2 + 4.5 = 6.5 s

Which means the iron ball was in air for 6.5 s.

For the iron ball,

Initial velocity is say, v

Final velocity will be –v

Acceleration due to gravity, g = -10 ms-2

Time of flight, t = 6.5 s

-v= v+gt-v=v-10*6.5

2v= 65v= 32.5m/s

So, the iron ball has to be thrown at a speed 32.5 m/s to make both the projectiles reach the ground at the same time.

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At the centre of curvature (b)

because the object is placed midway between two plane mirror distance a apart so the distance between nth order image formed in the two mirror is infinite.

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p=1/fso 20cm will give more convergence as f is small p is larger

p=1/fso 20cm will give more convergence as f is small p is larger

P=1/f where f is focal length and P is powerP=1/0.2= 5D and 2.5D respectivelyso for more convergent light lens with f=20cm should be used

p=1/fso 20cm will give more convergence as f is small p is larger

u= -30cm

f= +20cm

ho= +1cm

Using mirror formula,

1/v+1/u=1/f

1/v+1/-30=1/20

1/v-1/30=1/20

1/v=1/20+1/30

1/v=3+2/60

1/v=5/60=1/12

=>v= +12cm

Therefore, the image will be formed at a distance of 12cm behind the mirror.

m= -v/u

m= -12/-30

m= +0.4

m=hi/ho

0.4=hi/ho

0.4=hi/1

=>hi= +0.4cm

Therefore, the image formed is diminished in size.

Concave lens always has -ve focal length.

d is right answer bro

The main difference between linear and nonlinear programming is that a linear programming helps to find the best solution from a set of parameters or requirements that have a linear relationship while a nonlinear programming helps to find the best solution from a set of parameters or requirements that have a nonlinear relationship.

Linear programming is an important concept in optimization techniques in mathematics as it helps to find the most optimized solution to a given problem. On the other hand, nonlinear programming is the mathematical method of finding the optimized solution by considering constraints or objective functions that are nonlinear.

Object distance = Image distance .Therefore , distance of the image from the object will be =10 +10 =20 cm

To answer it, we first need to think aboutphases of matter: Gas, liquid, and solid.Matter is made up of particles calledatoms and molecules.If the particles are moving around very fast and they are spread far apart the matter is in thegas phase.If the particles are closer together and moving slowly around each other the matter is in aliquid phase.

Finally, if the particles are locked in position and not hardly moving at all the matter is in asolid phase.Wateris the name of the liquid phase of H2O molecules, andiceis the name of the solid phase.

The second thing we need to think about isdensity,which tells ushow tightly matter particles are packed together.Tightly packed matter is more dense than loosely packed matter. Also,less dense matter floats on top of more dense matter.So when you place ice cubes in your soft drink (which is mostly water) and your ice cubes float, you know thatice is less dense than water. This is a very special property of water.

Almost every other type of matter gets less densewhen it changes phase from asolid to a liquid, butwater gets more densewhen it changes fromsolid (ice) to liquid.

Why?Because ice is a crystal,which means it has a regular pattern with spaces in between molecules.

The spaces in the crystal are larger than the spaces between molecules in the liquid.More space = less dense,soice is less dense than water.So now we understand why ice floats on top of water, buthow does this work on a lake?Imagine that it is the beginning of winter, and the temperature has just gotten below freezing.Air changes temperature faster than water-- this is why a swimming pool seems much warmer in the evening. The air cools down at night, but the pool water remains almost as hot as it was during the day. So although the air is freezing cold, the water isn't freezing yet. The water at the very top of the lake is in direct contact with the cold air, so it freezes first. And because ice is less dense than water, the sheet of ice doesn't sink. If the temperature stays very cold, the sheet of ice gets thicker, but the ice also acts as a barrier, or insulator, between the cold air and the warmer water underneath.

The sheet of ice helps the rest of the water from becoming ice!The amazing fact that water freezes on the surface of a lake but not below it allows plants and fish to live through the winter in northern lakes and ponds. Imagine a lake without fish! So it is a good thing that H20 has the very strange property that its solid phase is less dense than its liquid phase.

I think it's simple answer is due to the anamolus behavior of water

B. Concave mirror

Focal length is negative for concave lens and concave mirror.

plane mirror is used in kaleidoscope

For plane mirror the usual mirror formula can be used

usual mirror formula involves object distanceu

image distancevand

f-the focal length

which is equal toR/2whereRis the radius of curvature.

the form of equation is

1/u + 1/v = 1/f = 2/R

the question is what is radius of curvature of a plane mirror?

if one takes the radius of curvature R to be very large compared to u and v then the curved surfaces will be planes.

so ifR is infinitely large then 2/R goes to zero.

so the plane mirror formula reduces to

1/u + 1/v =0 meansu = -v

so if object is placed in front of mirror , the image will be located behind the mirror.

however as the formula is trivial so its not used. but when several media gets coupled to plane mirror this concept is used .

To distinguish between a plane mirror, a concave mirror and a convex mirror without touching it, bring each mirror near to your face one by one and note the change in size of the image formed

Case 1: Inplane mirror, if the object is upright, the image is also upright, of same size and does not change in size by moving the mirror towards or away from the face.

Case 2: Inconcave mirror, if the object is upright, the image is also upright but magnified and increases in size by moving the mirror away from the face.

Case 3: Inconvex mirror, if the object is upright, the image is also upright but diminished and decreases in size by moving the mirror away from the face.

Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase after reaching its boiling point. The surrounding gas must not be saturated with the evaporating substance.As the faster-movingmoleculesescape, the remainingmoleculeshave lower average kinetic energy, and the temperature of the liquid decreases. This phenomenon is also called evaporative cooling. ... Three key parts toevaporation are heat, atmospheric pressure (determines the percent humidity), and air movement.

EXPLANATION OF EVAPORATION on the bases of molecular motion: Molecules of liquid have more spaces, the less molecular force of attraction and more K.E. than molecules of solids and can move throughout the liquid. While moving they can not escape the surface as they are being pulled inside by other molecules as there are no molecules above the surface. But when some molecules acquire sufficient K.E. (Threshold velocity), they overcome the ATTRACTIVE FORCES of other molecules and escape into the open space above the liquid. These escaping molecules from the vapor of the liquid and the process called Evaporation continues till all the liquid evaporates.

evaporation is the process of obtaining salt from water when water is come up in the sun is the best answer

evaporation is the process of obtaining salt from water when water is come up in the sun is the correct answer

the correct answer is 76

the correct answer is 76

Think dropping a cannonball with zero speed versus shooting it intoorbit. And for the same reason,if the Earthwere robbed of all of itsorbitalspeed, itwouldfall straight into the Sun. ...Ifwe zoomout, we see that most of the actionhappensinEarth'slast day.

Evaporation.Evaporationis one of the two forms ofvaporization. It is theprocesswhereby atoms ormoleculesin a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state

Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

Ans :- as themass ofeither object increases, theforce of gravitational attraction betweenthem also increases.

Sincegravitational force is inversely proportional to the square ofthe separation distancebetweenthe twointeractingobjects, more separation distance will result in weakergravitationalforces.

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भौतिकीऔरपदार्थ विज्ञानमेंक्यूरी ताप(Curie temperature (Tc)) याक्यूरी बिन्दु(Curie point) वहतापहै जिस पर उस पदार्थ कास्थायी चुम्बकत्वसमाप्त हो जाता है और केवलप्रेरित चुम्बकत्वही शेष रहता है

b)Carbon and silicon should be in same group because they both have 4 valency.

a)Carbon,oxygen and neon should be in same period cause they have same no. of shells

It will remain same because the internal energy of a gas depends only on its temperature.

No, it is an irreversible process.

In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero, or the point where if a force is applied it moves in the direction of the force without rotating.

Current in a conductor is due to flow of electron

An electric current is a flow of electric charge. In electric circuits this charge is often carried by electrons moving through a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas.

(i) is correct option

Centre of gravity, in physics, an imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be concentrated. ... In a uniform gravitational field the centre of gravity is identical to the centre of mass, a term preferred by physicists.

Theelectronic circuit symbolsmainly involve wires, power supplies, resistors, capacitors, diodes, transistors, meters, switches, sensors, logic gates, audio devices, and othercomponents

D) is the correct answer