Question

the lenses 1 and 2 are placed in contact focal length of lens when is 20 cm and of two is -10 centimetre calculate the total power of combination and what is the nature of combination​

Answer 1

Answer:

Explanation

10 is the power

Nature is that of a kaleidoscope

Answer 2

Answer:

Explanation:

By combined formula for the power of lens

=>D=(1/f1)+(1/f2),Here f1=0.2m,f2=-0.1m

=>D=-5 diopter.Ans..

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