Physics

Problem

A solar cooker uses a concave spherical mirror of focal length

40\,\text{cm}

to focus sunlight onto a cooking pot whose circular top has a radius of

12\,\text{cm}

. The pot’s center is placed on the principal axis

60\,\text{cm}

from the mirror’s surface. Assuming incoming sunlight is parallel to the axis and mirror aberrations are negligible, what is the minimum mirror diameter required so that the entire top surface of the pot is illuminated? a)

32\,\text{cm}

48\,\text{cm}

24\,\text{cm}

80\,\text{cm}

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