तरंग दैर्ध्य

250px|thumb|tarang dairdhy

• (aangrezi: Wave Length) kisi madhyam ke kisi kan ke ek poora kampan kiye jane par tarang jitani doori tay karati hai use tarang dairdhy kahate haian.
• tarang dairdhy ko λ (lemh da) se pradarshit karate haian.
• anuprasth tarangoan mean do pas-pas ke shrriangoan athava gartoan ke bich ki doori tatha anudairdhy tarangoan mean kramagat do sanpidan ya viralan ke bich ki doori tarang dairdhy kahalati haian.
• ise nimn sootr dvara jnat kiya ja sakata haian;-

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panne ki pragati avastha

adhar

prarambhik

madhyamik

poornata

shodh