two thin convex lenses of focal lenth 30 cm and 15 cm are placed in contact .what will be power of the combination
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Answered by
11
P = P1 + P2
P1 = 1 / 0.15 = 20/3 D
P2= 1/0.3 = 10/3 D
P = 20/3 + 10/3 = 30/3 = 10 Dioptre is the total power of the lenses.
P1 = 1 / 0.15 = 20/3 D
P2= 1/0.3 = 10/3 D
P = 20/3 + 10/3 = 30/3 = 10 Dioptre is the total power of the lenses.
Answered by
13
For first lens,
Power = 1/focal length in meter
= 1/0.3
= +10/3 D
For second lens,
Power = 1/focal length in meter
= 1/0.15
= +20/3 D
Power of combination of lenses,
Arithmetic sum of powers of both lenses
= (+10/3) + (+20/3)
= (+30/3)
= +10 D
Power = 1/focal length in meter
= 1/0.3
= +10/3 D
For second lens,
Power = 1/focal length in meter
= 1/0.15
= +20/3 D
Power of combination of lenses,
Arithmetic sum of powers of both lenses
= (+10/3) + (+20/3)
= (+30/3)
= +10 D
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