Question: () Between its optical centre and principal focus. Q5. 0 Two thin lenses of focal lengths 20 cm and- 5 cm are kept in

() Between its optical centre and principal focus. Q5. 0 Two thin

() Between its optical centre and principal focus. Q5. 0 Two thin lenses of focal lengths 20 cm and- 5 cm are kept in contact. What is the focal length and [2] power of the combination?

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