find the focal length and nature of lens which should be placed in contact with a lens of focal length 10cm so that the power of the combination becomes 5 dioptre
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bhoomkak210
Secondary SchoolPhysics 5+3 pts
Find the focal length and nature of a lens which should be placed in contact with the lens of focal length 10 cm so that the power of combination becomes 5 Diopter
Report by AparnaSureshkumar 12.04.2018
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TheUrvashi
TheUrvashi Maths AryaBhatta
Power(P2) of lens with 10 cm focal length = 10010=10D
Let Power of the lens is P1
Total power of combination = P1 +P2
5D= P1 + 10D
P1 = -5D
focal length = −15=−0.2m⇒−20 cm
Power of the lens is negative so the given lens is concave lens
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nikhilniki980
Nikhilniki980 Helping Hand
The power of the lens are
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