What are the applications of LDR (light dependent resistors)?

There are some applications of LDR which are given below.

The LDR is used in the infrared astronomy.
The LDR is used in light failure alarm circuits and used in light meter.
The LDR used in smoke detectors.
It is used for automatic contrast and brightness control in television receivers.
It is used in photosensitive relay
It is used in optical coding.
It is used in street light control circuits.
It is used in camera light meters.
It is used in the security alarm.
It is used as a proximity switch.
It is used in light activated control circuits.

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