Two different lense of power 3.5 and 2.5 diopters are in contact.find the focal length of the lenses
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Answer: Power of combination of lenses = +6 dioptres. The focal length of the combination of lenses = 1/Power of the lens, ie, 1/6 = + 0.1667 metres or + 16.67 centimetres.
Explanation:
If both lenses are Convex lens, then their powers are positive and hence the combination of lenses will produce a power equivalent to the power of a lens with focal length 16.67 centimetres.
Maybe you forgot to mention what type of lenses were those, were they converging or diverging? If you are not getting the point then ask again, I will give you a detailed explanation.
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