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it cannot emit wavelength of higher energy than absorbed one

it may emit wavelength of lower energy

rockey
u want to say that emitted wavelengths r different from absorbed ones

arre feyn
as in sodium , it emits its characteristic yellow lines because it (sodium) absorb that particular wavelength from white light

it is said that these r dark lines in sun spectrum corresponding to the wavelengths absorbed by the gases present in chromosphere .

now this absorbed wavelength (energy) must be reemitted .

where are those emitted wavelengths

is the ans.

answer is correct
=+7.5

here after placing the lense

u is taken for avirtual object and it is in the direction of rays at pt. p

ans=

b

if u donot have
buy

if u have gc agrawall read page85

read case of dispersion

please xplain maxwell's equation

see
acc. to cauchy's principle

refractive index=a+b/lambda sq.+c/lambda^4

thus r.i changes with wavelength

THERE IS NO ROD

the magnetic lines of force always form closed loops because monopoles donot exist.
electrostatic field lines donot form closed loops BUT INDUCED ELECTRIC LINES FORM CLOSED LOOPS