परावर्तन

thumb|250px|prakash kiran ka paravartan paravartan (aangrezi:Reflection) arthath "jab koee prakash ki kiran ek madhh‍yam se chalakar doosare madhh‍yam ki satah se takarakar vapas usi madhh‍yam mean laut aye to is ghatana athava kriya ko prakash ka paravartan kahate haian."

paravartan ke niyam

prakash ke paravartan ke nimn niyam haian-

1.ane vali kiran (apati kiran), paravartit kiran (jane vali kiran) evan abhilamh‍b tinoan ek hi tal mean hote haian.

2.apatan kon (i), paravartan kon (r) ke barabar hota hai. atah i = r

isaka arth yah nikalata hai ki jitane kon par koee prakash ki kiran kisi darpan par giregi, vah utane hi kon se girane ke pashh‍chat vapas chali jayegi.

3.paravartan ki kriya mean prakash ki avriti evan chal parivartit nahian hoti arthath prakash ki oorja kam nahian hoti hai.

4.niyam 2 se kaha ja sakata hai ki yadi apatan kon shoonh‍y ho to paravartan kon bhi shoonh‍y hoga. is sh‍thiti mean prakash ki kiran jis marg se ati hai, usi marg se vapas chali jati hai ya ise is prakar bhi kah sakate haian ki abhilamh‍bavat apatan ki sh‍thiti mean prakash kiran apane agaman marg se paravartit ho jati hai.

panne ki pragati avastha

adhar

prarambhik

madhyamik

poornata

shodh

sanbandhit lekh

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