ஒளி
ஒளி எதிரொளிப்பு: ஒளியானது பொருளின் மீது விழுந்த பிறகு திருப்பி அனுப்பப்படும் நிகழ்வு ஒளி எதிரொளிப்பு எனப்படும். எதிரொளிப்பு விதிகள்: 1. படுகதிர் , எதிரொளிப்புக்கதிர் , படுபுள்ளியில் வரையப்பட்ட குத்துக்கோடு ஆகியவை ஒரே தளத்தில்அமையும். 2. படுகோணமானது எதிரொளிப்புக் கோணத்திற்ககுச் சமம். எதிரொளிப்பின் வகைகள்: 1. ஒழுங்கான எதிரொளிப்பு 2. ஒழங்கற்ற எதிரொளிப்பு ஒழுங்கான எதிரொளிப்பு: பளபளப்பான சமதளப்பரப்பில் எதிரொளிப்பு நிகழ்ந்தால் அது ஒழுங்கான எதிரொளிப்பு எனப்படும். ஒழுங்கற்ற எதிரொளிப்பு: ஒளி , சொரசொரப்பான பரப்பில் படும்போது , அது பல்வேறு திசைகளில் சிதறலடைகிறது. எனவே இவ்வகைப் பரப்பில் எதிரொளிப்பு ஒழுங்கற்று காணப்படுகிறது. இதுவே ஒழுங்கற்ற எதிரொளிப்பு எனப்படும். பன்முகப் பிம்பங்கள்: ஒரு சமதள ஆடியானது ஒரு பொருளுக்கு ஒரேயொரு பிம்பத்தைத் தான் தோற்றுவிக்கும். ஆனால் ஒன்றிற்கு மேற்பட்ட சமதள ஆடிகளைத் தகுந்த கோணத்தில் அமைத்தால் , அவை ஒரு பொருளுக்குப் பல பிம்பங்களைத் தோற்றுவிக்கும். இவையே பன்முகப் பிம்பங்கள் ...

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