Define power of lens ? writes it s.i unit .a student uses focal length 40 cm and -20cm write nature and power of lens . also find power and nature of. Combination of this two lens?
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The ability of a lens to converge or diverge light rays is called Power of a lens . it is defined as the resiprocal of focal length .
It's SI unit is dioptre .
when two or more thin lenses are used in combination, the equivalent focal length (f) and power of the combination (p) can be calculated as :
1/f =1/f1 + 1/f2 +..... and p =p1+ p2 +....
magnification of lens in combination (m)
m =m1 ×m2×...
It's SI unit is dioptre .
when two or more thin lenses are used in combination, the equivalent focal length (f) and power of the combination (p) can be calculated as :
1/f =1/f1 + 1/f2 +..... and p =p1+ p2 +....
magnification of lens in combination (m)
m =m1 ×m2×...
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