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Refraction through Multiple Spherical Surfaces

The focal len...

Question

The focal length of an $\frac{f}{4}$ camera lens is 300 mm. what is the aperture diameter

A

75 mm

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B

650 mm

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C

800 mm

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D

1200 mm

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Solution

The correct option is B 75 mm
Aperture diameter is given by
$A = \frac{f}{4}$

Given $f = 300 m m$

$⟹ A = \frac{300}{4} = 75 m m$

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