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Ray Optics And Optical Instruments

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Two lenses of power -15D and +5D are in contact with each other. The focal length of the combination is

-20 cm

-10 cm

+20 cm

+10 cm

Solution

B.

-10 cm

P = P₁ + P₂ = −10
f= 1/P
= 0.1 m
= -10 cm

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