Which one of the following determines the sharpness of image in a camera ?
1). The aperture
2). The exposure time
3). The focal length of the lens
4). Size of the camera
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1. Colours of thin films are due to?
2. Water pipes in hilly areas often burst on a cold frosty night, because
3. Which determines the frequency of a sound wave?
4. The odometer guage indicates
5. What will happen if an object is dropped from a height and there is no air resistance?
6. Oil rises up the wick in a lamp because
7. The concentration of pollutants in atmosphere is generally expressed in: