Two convex lenses with power 2 dioptre are kept in contact with each other. The focal length of the combined lens system is

0.10m

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0.25m

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Solution

The correct option is D 0.25m
Power = $\frac{1}{f}$
Power = 2
$⟹ f = 0.5 m$
Combined Power = 4 dioptre
Combined focal length = 0.25m

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Two convex lenses with power 2 dioptre are kept in contact with each other. The focal length of the combined lens system is

The correct option is D 0.25mPower = 1fPower = 2⟹f=0.5mCombined Power = 4 dioptreCombined focal length = 0.25m

The correct option is D 0.25m
Power = $\frac{1}{f}$
Power = 2
$⟹ f = 0.5 m$
Combined Power = 4 dioptre
Combined focal length = 0.25m