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mirror formula is

1/v + 1/u = 1/f

where

v is the image distance

u is the object distance

f is the focal length of given mirror

Mirror Formula 1/f=(1/u+1/v) where as f is focal length and image distance is (v) and object distance is (u)

Please post the complete picture of the question.

answer a gaya par photo nahi send ho rahi

let the gravitational force on a be g×2b/4b^2 and on b the force is gb/r^2 now divide force of b by a 4/2 = 2 times therefore the gravitational force on b is twice of a

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Neutrons by James Chadwick and electrons by J J Thomson

please give the derivation

Ray parallel to the principle axis strike at a point ‘A’ on the mirror.

To make a normal at any point on the spherical mirror a line passing through center of curvature is taken.

As per the rules of reflection: angle of incidence = angle of reflection

∠i = ∠r ........(1)

As OA and CP are parallel to each other, we get

∠ACF = i

And

∠FCA = i ............ from eq.1

∴ ∠ACF = ∠FCA = i

∴ CF = FA

When incident ray comes closer to principle axisFA = FP

∴ CF = FP

Then,

R = CP

R = CF + FP

R = f + f

∴ R = 2f

The distance from the pole of the concave mirror to the centre of curvature is called the radius of curvature (R).

Image will be :-1:- virtual2:- erect3:- dimnished4:- in front of mirror

vjctdhiho hvuhoje vydtgil

The answer is option 2.

Ans :- The mobile phone can be used to communicate over long distances without wires. It works by communicating with a nearby base station (also called a "cell site") which connects it to the main phone network. When moving, if the mobile phone gets too far away from the cell it is connected to, that cell sends a message to another cell to tell the new cell to take over the call. This is called a "hand off," and the call continues with the new cell the phone is connected to. The hand-off is done so well and carefully that the user will usually never even know that the call was transferred to another cell.

As mobile phones became more popular, they began to cost less money, and more people could afford them. Monthly plans became available for rates as low as US$30 or US$40 a month. Cell phones have become so cheap to own that they have mostly replacedpay phonesand phone booths except forurban areaswith many people.

In the21st century, a new type of mobile phone, calledsmartphones, have become popular. Now, more people are using smartphones than the old kind of mobile phone, which are calledfeature phones.

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Normally our eyes are not able to see the movement of air but we feel it. When air is heated up, it acquires heat energy and becomes hot, the cold air rushes to push the hot air up. This is really happening and due to this objects are seen as wavering or haizy. This is otherwise called as mirage, an optical illusion.

since potential doesn't varies perpendicular to the electric Field.. and in the direction of electric Field potential decreases....

so 1) Va - Vd = 0 2) Va -Vc = E*(Dab) = 20V 3) Vb-Vd = E(-Dab) = -20V 4) Vc-Vd = E(Dcd) =. -20v

B is the Right Answer

option C is correct as speed remains constant with change in time

bro plzz tell me this is ncery oqurs or not

Capacitanceis directly proportional to the electrostatic force fieldbetweentheplates. This field is stronger when theplatesare closer together. Therefore, as thedistance betweentheplatesdecreases,capacitanceincreases. ... Therefore, as the dielectric constant increases,capacitanceincreases.

Let the angle be x and 2x

x + 2x = 180

3x = 180

x = 60

all the angles are 60° , 120° , 60° , 120°

Given, Ratio of two adjacent angles of a parallelogram=2:1

let the two adjacent angles be 2x and 3x

we know that sum of two adjacent angles=180°

therefore,2x+3x=180° 5x=180° x=180÷5 x=36°the angles=2×36,1×36 = 74, 36we know that the opposite angles of a parallelogram are equaltherefore, the opposite two angles=74 ,36

Physical Characteristics of Blood

Thicker (more viscous) than water and flows more slowly than water.

Temperature of 100.4 degrees F.

pH 7.4 (7.35-7.45)

8 % of total body weight

Normal supply voltage is 240/220 volt so it is the answer to that question

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The rms value is. = √[(2A)²+(-2A)²+(2A)²]/3 = √12A²/3 = √4A² = 2A

Refraction is the phenomenon of bending of light when it passes from one medium to the other.It occurs because light has different speeds in different medium.

Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another. This bending by refraction makes it possible for us to have lenses, magnifying glasses, prisms and rainbows

Lightrefracts whenever it travels at an angle into a substance with a differentrefractiveindex (optical density). This change of direction iscausedby a change in speed. For example, whenlighttravels from air into water, it slows down, causing it to continue to travel at a different angle or direction.

f = R/2 = 40/2 = 20cm

with step

F= R/2R = 40F = 40/2=20

Option B. 2when it enters the glass slab and when it exits.

in glass slab refraction takes place 2 times

For the DC current (Direct current), when you change the direction of the current in an electromagnet, the North and South poles of the elec-magnet will be reversed.

With the AC current, it constantly (continuously) changes its current direction, hence the North and the South poles will change continuously, too. That is an application for the motor.

Refraction occurs specifically because light travels at different speeds in different media.

In a PN junction diode, thereverse saturation currentis due to the diffusive flow of minority electrons from the p-side to the n-side and the minority holes from the n-side to the p-side. ... The is flows in thereversebias condition of the diode is calledreverse saturation current.

the potential energy would be converted to kinetic energy. the potential energy is given byP.E.= mghacceleration due to gravity and height is same for both the balls, the one with mom as we have more energy. so the cricket ball will have more energy.

the time taken by the balls to reach the ground could be same if a resistance and other factors and neglected. Power= Workdone/ timeas time is same, the ball which has lesser work would have lesser power. plastic ball would have lesser power.

During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away.

अक्षीय झुकाव(अंग्रेजी: Axial tilt)खगोलशास्त्रमें किसीकक्षा(ऑरबिट) में परिक्रमा करतीखगोलीय वस्तुकेघूर्णन अक्ष(एक्सिस) और उसकी कक्षा पर खड़े किसी काल्पनिक लम्ब (परपॅन्डीक्यूलर) के बीच बने कोण (ऐंगल) को कहते हैं।

अगर किसीपृथ्वीजैसी गोल वस्तु की दोनों मुख हिलावाटों को देखा जाए - अपने अक्ष परघूर्णन(रोटेशन) औरसूरजके इर्द-गिर्द परिक्रमा - तो अक्षीय झुकाव होने से उसके ध्रुव कक्षा (ऑरबिट) के मार्ग के ठीक ऊपर या नीचे नहीं होते। एक ध्रुव कक्षा से ज़रा अन्दर सूरज के थोड़ा अधिक समीप होता है और दूसरा कक्षा से ज़रा बाहर सूरज से थोड़ा दूर। परिक्रमा करते हुए कुछ देर बाद अन्दर वाला ध्रुव बाहर आ जाता है और दूसरा वाला अन्दर। यही मौसम बदलने का मुख्य कारण है - जब दक्षिणी ध्रुव अन्दर को होता है तो दक्षिणी गोलार्ध (हेमिस्फ़ीयर) में गर्मी का मौसम चलता है और उत्तरी में सर्दी का। छह महीने बाद जब पृथ्वी अपनी कक्षा के दूसरी पार होती है तो पासा पलट जाता है - दक्षिणी गोलार्ध (हेमिस्फ़ीयर) में सर्दियाँ होती हैं और उत्तरी में गर्मियाँ।

the photoelectric effect is based upon the law of conservation of energy.so option b is the right answer.

Triple Bonds

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C. Red

Explaination : Wavelength is inversely proportional to the deviation in the path of the light. Red light suffers the least amount of deviation

Option A is correct.Yellow does not contain blue, so yellow stripes will appear black under yellow light. White objects reflect all light, so will appear to be the colour of the light on them. Hence, white stripes will appear yellow.