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  4. The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is

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Q. The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is

CMC MedicalCMC Medical 2010

Solution:

$ P={{P}_{1}}+{{P}_{2}} $ $ =\frac{100}{{{f}_{1}}}+\frac{100}{{{f}_{2}}}, $ both $ {{f}_{1}} $ and $ {{f}_{2}} $ are in cm. $ =\frac{100}{50}-\frac{100}{40} $ $ =2-2.5=-\,0.5\,D $