Ultraviolet and Infrared rays

Slide 1 : Spectrum of visible light

INFRARED AND ULTRAVIOLET RAYS : INFRARED AND ULTRAVIOLET RAYS FRAQUENZY INCREASES FREQUENZY DECREASES Wave length increases Wave length decreases

Infrared rays : Infrared rays They are heat rays They are used to take the photographs of distant objects Used in view finders used in remote control of TV IR lamps are used for heat therapy

Ultraviolet rays : Ultraviolet rays produce vitamin D in skin cause vision problems cause sun burn cause skin cancer

Slide 5 : HOW UV RAYS AFFECT D.N.A

Ozone layer absorbs uv rays coming from the sun. : Ozone layer absorbs uv rays coming from the sun. O2 O+O O2+O O3

The OZONE LAYER acts as a shield and protects the earth by absorbing most of the harmful ULTRA VIOLET RADIATIONS carried by the sun. : The OZONE LAYER acts as a shield and protects the earth by absorbing most of the harmful ULTRA VIOLET RADIATIONS carried by the sun. Ozone layer is found between the altitudes of 19km and 35km from the surface of the earth. It is found in the STRATOSPHERE of the earth’s atmosphere.

LAYERS OF ATMOSPHERE : LAYERS OF ATMOSPHERE Troposphere Stratosphere Mesosphere Thermosphere Ionosphere Exosphere