Lens 2

What are the main functions of a lens or lens assembly on a camera in a surveillance system?

• Defining the field of view

• Controlling the amount of light passing through to the image sensor

• Focusing by adjusting elements within the lens assembly

• All of the above

How does the amount of light passing through a lens affect the quality of the picture in a surveillance system?

• The more light that passes through, the worse the quality of the picture

• The less light that passes through, the better the quality of the picture

• The more light that passes through, the better the quality of the picture

• The amount of light does not affect the quality of the picture

What is the main function of a lens in a security camera?

• Capture sound for audio recordings.

• Define the field of view (how much of the scene is seen).

• Connect the camera to the security system.

• Power the camera with electricity.

What factors affect the size and clarity of the image quality in a surveillance system?

• Distance from the scene

• Focal length and Field of view

• Lighting and format

• All of the above

Why is the selection of a lens critical in a surveillance system?

• It directly affects the size, shape, and sharpness of the image

• It indirectly affects the size, shape, and sharpness of the image

• It has no effect on the size, shape, and sharpness of the image

• It only affects the lighting of the image

In which type of environment is a fixed lens typically used?

• Outdoor environments where the viewing angle needs to be adjusted

•  Indoor environments where the viewing angle does not need to be adjusted

• Outdoor environments where the scene lighting is constantly changing

• Indoor environments where the iris needs to be adjusted

How does a varifocal lens differ from a fixed lens?

• A varifocal lens allows the user to manually adjust the camera's lens, while a fixed lens cannot be adjusted by the user

• A varifocal lens is recommended for outdoor conditions, while a fixed lens is recommended for indoor conditions

• A varifocal lens offers a range of focal length, while a fixed lens only offers one focal length

• A varifocal lens is not recommended for outdoor conditions, while a fixed lens is recommended for outdoor conditions

In which type of environment is a varifocal lens typically used?

• Indoor environments where the viewing angle does not need to be adjusted

• Outdoor environments where the viewing angle needs to be adjusted

• Outdoor environments where the scene lighting is constantly changing

• Indoor and outdoor environments requiring flexible viewing angle

What is the iris and what is its function in a camera?

• A mechanical device that adjusts the amount of light passing through the lens of a camera

• A device that controls the aperture of the lens

• A device that controls the shutter time of the camera

• A device that controls the sensitivity of the sensor

How does the aperture size in the iris affect the amount of light that passes through the lens?

• A smaller aperture size allows more light to pass through, while a larger aperture size allows less light to pass through

• A larger aperture size allows more light to pass through, while a smaller aperture size allows less light to pass through

• The aperture size has no effect on the depth of field of the image

• The aperture size does not affect the amount of light passing through the lens