A certain photograph will be correctly exposed at a shutter speed of $0.01 \mathrm{~s}$ at a lens opening of $\mathrm{f2.8}$. What lens opening is needed for a shutter speed of $0.04 \mathrm{~s}$ ?

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The Answer of A certain photograph will be correctly exposed at a shutter speed of $0.01 \mathrm{~s}$ at a lens opening of $\mathrm{f2.8}$. What lens opening is needed for a shutter speed of $0.04 \mathrm{~s}$ ?

A Certain Photograph Will Be Correctly Exposed at a Shutter 0.01 s0.01 \mathrm{~s}0.01 s

A Certain Photograph Will Be Correctly Exposed at a Shutter $0.01 \mathrm{~s}$