Question

Two convex lens of focal length 20 cm and 25 cm are placed in contact with each other, then power of this combination is

Answer 1

Answer:

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Explanation:

P1=1/F                                                      P2=1/F

=100/20                                                      = 100/25

       =5D                                                            =4D

P1 +P2 = EFFECTIVE POWER

4D+5D

=9D