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
3. If cream is removed from milk, its density
4. As water is cooled from 4 deg C to 0 deg C, its density
5. ?Which of the following?electromagnetic waves has the longest wavelength?
6. Wind and solar energy are examples of
7. Sound waves do not exhibit the phenomenon of