Underwater Led

A small underwater LED light illuminates the surface of the water 2 m directly above it. What is the radius of?

I think it's the circle of the surface of the water.

Discover Underwater Led On eBay Below:

Underwater Kinetics Light Cannon L1 eLED Dive Light
Underwater Kinetics Light Cannon L1 eLED Dive Light
$199.95
8000LM Waterproof XML2 T6 LED Scuba Diving Underwater 100M Flashlight Lamp
8000LM Waterproof XML2 T6 LED Scuba Diving Underwater 100M Flashlight Lamp
$30.49
BlueFire 1000LM Xml L2 Scuba Dive Diving LED Flashlight Torch 100m Underwater
BlueFire 1000LM Xml L2 Scuba Dive Diving LED Flashlight Torch 100m Underwater
$53.13
Goldengulf Cree XM L2 Led Scuba Diving Flashlight Torch Underwater 100M
Goldengulf Cree XM L2 Led Scuba Diving Flashlight Torch Underwater 100M
$41.10
Hollis LED Mini 3 Underwater Backup Scuba Diving Flashlight
Hollis LED Mini 3 Underwater Backup Scuba Diving Flashlight
$79.98
Diving Light Underwater Video 15 XML2+6 Red+6 UV LED Photography Flashlight TB
Diving Light Underwater Video 15 XML2+6 Red+6 UV LED Photography Flashlight TB
$59.43
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
$82.78
LED Dive Flashlight Torch Waterproof Scuba Underwater Light Promate 180 Lumens
LED Dive Flashlight Torch Waterproof Scuba Underwater Light Promate 180 Lumens
$19.95
Underwater 100m 20XM L2 LED Diving Camera Fill Light Lamp Lantern Flashlight
Underwater 100m 20XM L2 LED Diving Camera Fill Light Lamp Lantern Flashlight
$74.27
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
$82.78
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
$82.78
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
Diving Underwater 20XM L2 LED Video Camera Fill Light Lantern Flashlight
$82.78
Underwater 100m 8000LM XM L2 LED Scuba Diving Flashlight Torch 26650 Light Lamp
Underwater 100m 8000LM XM L2 LED Scuba Diving Flashlight Torch 26650 Light Lamp
$26.99
10000lm XM L T6 LED Diving Scuba Flashlight Torch Lamp Underwater 100M 218650 D
10000lm XM L T6 LED Diving Scuba Flashlight Torch Lamp Underwater 100M 218650 D
$16.71
Underwater 150m 10000lm 6x XM L2 LED Diving Flashlight Torch 18650 Waterproof
Underwater 150m 10000lm 6x XM L2 LED Diving Flashlight Torch 18650 Waterproof
$105.99
Portable Professional Underwater 2000Lm XM L2 LED Diving Headlight Black
Portable Professional Underwater 2000Lm XM L2 LED Diving Headlight Black
$44.31
Underwater 120m 12000Lm 3T6 L2 LED Scuba Diving Flashlight Fishing Torch 18650
Underwater 120m 12000Lm 3T6 L2 LED Scuba Diving Flashlight Fishing Torch 18650
$17.09
10000LM 3x XM L T6 LED 18650 26650 Diving Scuba Flashlight Torch Underwater 100m
10000LM 3x XM L T6 LED 18650 26650 Diving Scuba Flashlight Torch Underwater 100m
$19.99
8000LM XML L2 LED Scuba Diving Underwater 500M Flashlight Torch Waterproof Set
8000LM XML L2 LED Scuba Diving Underwater 500M Flashlight Torch Waterproof Set
$9.86
Underwater Waterproof Diving Night Video LED Light for GoPro Hero 1 2 3
Underwater Waterproof Diving Night Video LED Light for GoPro Hero 1 2 3
$30.74
TrustFire 100M Underwater Diving Flashlight TrustFire DF007 800LM LED Y2A4
TrustFire 100M Underwater Diving Flashlight TrustFire DF007 800LM LED Y2A4
$19.55
Diving Light Underwater Video 15XML2+6 Red+6 UV LED Photography FlashlightLampM
Diving Light Underwater Video 15XML2+6 Red+6 UV LED Photography FlashlightLampM
$81.44
Underwater 100m 15000LM 4x XM L L2 LED Scuba Diving Flashlight Torch 18650 26650
Underwater 100m 15000LM 4x XM L L2 LED Scuba Diving Flashlight Torch 18650 26650
$26.50
KC Fire Waterproof Scuba UV Light 6  UV LED Flashlight 1800LM Underwater Torch
KC Fire Waterproof Scuba UV Light 6 UV LED Flashlight 1800LM Underwater Torch
$102.87
Underwater 100m 6000LM XM L2 LED Scuba Diving Flashlight Torch 18650 26650 Lamp
Underwater 100m 6000LM XM L2 LED Scuba Diving Flashlight Torch 18650 26650 Lamp
$13.99
Red Waterproof 6000LM XM L2 LED Scuba Diving Flashlight Underwater 100m 18650 C
Red Waterproof 6000LM XM L2 LED Scuba Diving Flashlight Underwater 100m 18650 C
$13.29
Underwater 1200LM XM L T6 LED Diving Flashlight Torch Lamp Light Waterproof
Underwater 1200LM XM L T6 LED Diving Flashlight Torch Lamp Light Waterproof
$3.79
INON LED Flash Light LF800 N 456212143779 Underwater Lighting Dive Gear
INON LED Flash Light LF800 N 456212143779 Underwater Lighting Dive Gear
$272.00
8 Modes 2000LM T6 LED Diving Flashlight Torch Underwater Waterproof lamp 328FT
8 Modes 2000LM T6 LED Diving Flashlight Torch Underwater Waterproof lamp 328FT
$27.99
Led Cree Xm T6 Diving Flashlight Torch Light Underwater Waterproof Lamp Scuba
Led Cree Xm T6 Diving Flashlight Torch Light Underwater Waterproof Lamp Scuba
$27.90
Underwater Flashlight Led Diving Powerful Waterproof T6 Torch Cree XML Scuba Kit
Underwater Flashlight Led Diving Powerful Waterproof T6 Torch Cree XML Scuba Kit
$39.90
Underwater Flashlight Led Xm T6 Diving Cree 3800LM La Waterproof Scuba Light Set
Underwater Flashlight Led Xm T6 Diving Cree 3800LM La Waterproof Scuba Light Set
$33.90


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