With diaphragm of the camera lens set at `(f)/(2)` , the correct exposure time is `(1)/(100)` , then with diaphragm set at `(f)/(4)`. Calculate the co

Question

With diaphragm of the camera lens set at `(f)/(2)` , the correct exposure time is `(1)/(100)` , then with diaphragm set at `(f)/(4)`. Calculate the co

With diaphragm of the camera lens set at `(f)/(2)` , the correct exposure time is `(1)/(100)` , then with diaphragm set at `(f)/(4)`. Calculate the correct exposure time.

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

As exposure time `prop(1)/(("aperture")^(2)) implies t_(1) prop (1)/([f//2]^(2)) "and" t_(2) prop (1)/([f//4]^(2))`
here `t_(1) = (1)/(100)"s then" (t_(2))/(t_(1)) = (16)/(4) = 4 implies t_(2) = 4t_(1) = (4)/(100)"s"`

4 views Answered 2023-02-05 15:29