Hawa Bhi Ek Lens Hai 🌫️
Ab tak humne roshni ko kaanch aur paani mein mudte dekha. Par ek aur medium (maadhyam) hai jise hum roz dekhte hain aur kabhi dhyaan nahi dete — hawa.
Prithvi ka vaayumandal (atmosphere) ek jaisa nahi hai. Zameen ke paas ki hawa ghani (dense) hai; jaise-jaise upar jaao, hawa patli hoti jaati hai. Yani upar se aati roshni ko har parat par thoda-thoda mudna padta hai. Isi ko atmospheric refraction (apvartan) kehte hain.
📌 Roshni patli hawa se ghani hawa mein aa rahi hai — yani kam ghane se zyada ghane
medium mein. Isliye wo normal ki taraf mudti jaati hai.
Aur kyunki hawa ki ghanapan dheere-dheere badalti hai, roshni ek jagah nahi
mudti — wo ek halki si curve banati hui aati hai.
⭐ Taare Kyun Timtimate Hain?
Raat ko aasman dekho — taare timtimate (twinkle) hain. Par grah (planets) jaise Mangal ya Shukra sthir chamakte hain, timtimate nahi. Kyun?
📌 Taare timtimate hain kyunki:
🔹 Taare itne door hain ki wo hume ek bindu (point source) jaisa dikhta hai
🔹 Hawa lagataar hilti rehti hai (garam-thandi parat aati-jaati hain)
🔹 Isse taare ki roshni ka raasta baar-baar badalta rehta hai
🔹 Kabhi thodi zyada roshni aankh tak pahunchti hai, kabhi thodi kam →
timtimahat
📌 Grah nahi timtimate kyunki: wo hume ek chhoti thaali (disc)
jaisa dikhta hai — yani bahut saare bindu ek saath. Kisi bindu ki roshni badhi,
kisi ki ghati — sab mil kar barabar ho jaata hai. Isliye chamak sthir rehti hai.
Yahi timtimahat vaigyanikon ke liye sabse badi museebat hai — isse taaron ki
tasveerein dhundhli ho jaati hain.
Isiliye bade telescope ooncho pahaadon par lagaye jaate hain (jahan upar kam hawa
bachi ho) — jaise Ladakh mein Hanle ka Indian Astronomical Observatory, jo lagbhag
4,500 metre ki oonchai par hai aur duniya ke sabse ooncho mein se ek hai.
Aur Hubble telescope ko toh space mein hi bhej diya gaya — kyunki wahan hawa hai
hi nahi, toh timtimahat bhi nahi!
🌅 Sooraj Jaldi Ugta Aur Der Se Doobta Hai
Ye sunkar ajeeb lagega, par sach hai: aap sooraj ko us waqt dekh lete hain jab wo abhi ufaq (horizon) ke neeche hota hai!
📌 Kya hota hai: sooraj ki roshni hawa ki parton se mudti hui aati hai. Hamara
dimaag maanta hai ki roshni seedhi aayi hai — isliye sooraj
apni asli jagah se thoda UPAR dikhta hai.
Nateeja:
🌅 Sooraj lagbhag 2 minute pehle dikh jaata hai (advance sunrise)
🌇 Aur lagbhag 2 minute baad tak dikhta rehta hai (delayed sunset)
☀️ Yani din lagbhag 4 minute lamba ho jaata hai!
Aur sooraj apne poore chaudai (half a degree) jitna upar khisak jaata hai — yani
jab aap "sooraj ufaq ko chhoo raha hai" dekhte ho, tab wo asal mein
poora doob chuka hota hai.
Dhyaan se dekha ho toh ugte ya doobte sooraj ka aakaar gol nahi, thoda chapta lagta
hai — jaise koi anda.
Wajah: sooraj ke neeche wale kinaare se aayi roshni ko hawa ki
zyada moti parat paar karni padti hai (kyunki wo aur neeche se aa rahi hai), toh wo
zyada mudti hai. Upar wale kinaare ki roshni kam mudti hai.
Yani neeche wala kinara upar wale se zyada uthta hai — aur sooraj
upar-neeche se dab kar chapta dikhne lagta hai. Dopahar mein aisa nahi hota,
kyunki tab roshni lagbhag seedhi upar se aati hai.
🔥 Aag Ke Upar Cheezein Hilti Kyun Dikhti Hain?
Chulhe, aag ya garam sadak ke upar se dekho — peeche ki cheezein hilti, kaampti hui dikhti hain. Ye bhi wahi atmospheric refraction hai.
📌 Aag ke upar ki hawa garam ho jaati hai, isliye wo
patli (kam ghani) ho jaati hai. Aur garam hawa lagataar
upar uthti aur hilti rehti hai.
Isse roshni ka raasta lagataar badalta rehta hai — bilkul taaron ki timtimahat ki
tarah. Isiliye peeche ki cheezein kaampti hui dikhti hain.
Yahi cheez garmi mein sadak par mirage banati hai — jo aapne Light chapter mein
padha tha (wahan TIR bhi shaamil ho jaata hai).
Bharat mein Ramzan aur Eid ka chaand dekhna, aur kai vrat aur tyohaar ke samay,
seedhe sooraj ugne aur doobne ke waqt par tay hote hain. Panchang aur
islamic calendar banane wale isi atmospheric refraction ka hisaab lagate hain —
warna samay 2-3 minute galat ho jaata.
Isi tarah namaz ke waqt (fajr aur maghrib) bhi isi hisaab par tay hote hain, aur
hindu panchang mein sooryodaya-sooryast ke samay bhi.
Aur ek aur jagah ye zaroori hai: ISRO ke satellite se li gayi prithvi ki
tasveeron mein bhi ye mudav theek karna padta hai — warna zameen par ki jagah
galat jagah par dikhegi. Ek chhota sa refraction, aur usse crore rupaye ke
satellite ka data theek hota hai.
🧠 Apne Aap Ko Test Karo
🧊 3D Living Eye lab mein dekho ki aankh tak pahunchi roshni ka kya hota hai!
Open 3D Living Eye →