ICSE − Q & A

Guys just to share a fact that in lens diagrams 
Remember we have to erase those extra lines after intersection of light rays else  a hollow image will be formed (this is an error given in Selina book)

what is the principle of a magnifying glass

Someone please explain pg 240 example 1 (ii)

Are questions repeated in physics?

If colour of wires is asked we have to write old convection or new convection or both are correct

+ 1 more questions by teleansh  

1) At which points does resonance is heard (i read somewhere there are 3 situations etc.) 2) is frequency directly proportional to square root of radius or proportional to of radius ? 3) Factors affecting Critical Angle. (i think refractive index and wavelength of light is appropriate but in my book instead of R.I. temperature is given)
asked by Ansh Anand (teleansh) 5 years ago
1

What are the energy changes in a soldering iron in use?

If its given to find the focal length when power is -2D, will the answer be in negative since it is a convex lens or what?

in physics,which chapters is most important?

how can i make coefficient of friction 0?

If there are two guitars which have the same frequency and amplitude how can they be differentiated?(The first thought that stuck me was that their quality can differentiate them but is quality different for the same instruments?)