The give reasons:

23. Mention three properties of infrared radiation similar to the visible light.

24. Give how properties of infrared radiations which differ front the visible  light.

25. Name the material of prism required for obtaining the spectrum of (a) ultraviolet light, (b)infrared radiations. 
                             Ans. (a) quartz (b) rock salt

 

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23.
*They do not cause have heating effect
*They do not cause fluorescence.
*They do not have serious effects on body.
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