Physics

Physics

Problem

A concave lens has focal length 20 cm20\,\text{cm}. An object is placed 30 cm30\,\text{cm} in front of the lens along the principal axis. Which of the following sign combinations for (u, v, f)(u,\,v,\,f) follows the Cartesian sign convention? a) (+30 cm,−12 cm,−20 cm)(+30\,\text{cm}, -12\,\text{cm}, -20\,\text{cm}) b) (−30 cm,−12 cm,+20 cm)(-30\,\text{cm}, -12\,\text{cm}, +20\,\text{cm}) c) (−30 cm,−12 cm,−20 cm)(-30\,\text{cm}, -12\,\text{cm}, -20\,\text{cm}) d) (−30 cm,+12 cm,−20 cm)(-30\,\text{cm}, +12\,\text{cm}, -20\,\text{cm})

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