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CBSE Class 12-science Answered

Why does a tank appear shallower than its actual depth?
Asked by Topperlearning User | 20 May, 2014, 03:25: PM
answered-by-expert Expert Answer
On account of refraction of light a tank appear shallower than its actual depth. Suppose a ray of light is incident normally and passes straight along OAA'. Another ray of light from O incident at angle get refracted by an angle r deviates away from the normal. In figure OA passes straight along OAA’. Another ray of light from O incident at angle i on XY along OB deviates away from normal. It gets refracted at angle r along BC. When we produce back BC meets OA at I. Hence it’s the virtual image of O. Hence AI is the apparent depth and AO is the real depth.
 
Answered by | 20 May, 2014, 05:25: PM
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