Golaakaar darpan: avtal aur uttal
Short mein jawab
Golaakaar darpan ki paraavartak sateh khokhle gole ke hisse jaisi mudi hoti hai. Avtal darpan andar muda hota hai: paas ki vastu ka pratibimb seedha aur bada, door ki ka ulta. Uttal darpan baahar ubhra hota hai aur hamesha seedha, chhota pratibimb chaude drishya ke saath deta hai. Torch aur dentist avtal, gaadiyaan uttal darpan lagaati hain.
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Mude hue darpan
Class 7 mein tumne dekha ki samtal darpan ka pratibimb seedha aur theek vastu jitna bada hota hai. Mude darpan alag vyavhaar karte hain. Steel ka chamakta chammach chehre ke paas pakdo (Activity 10.1). Uske khokhle andar ke hisse mein chehra ulta dikhta hai; ubhre peechhe ke hisse par seedha par chhota. Chammach do mude darpanon ki tarah kaam kar raha hai.
Golaakaar darpan aisa muda darpan hai jiski paraavartak sateh ek kaalpanik khokhle gole ka hissa hai. Paraavartak sateh andar mudi ho, chammach ke andar ki tarah, to avtal darpan. Baahar ubhri ho, chammach ki peeth ki tarah, to uttal darpan. Chitron mein peechhe ki, na chamakne wali, taraf ko chhaayaankit (hatched) dikhaate hain.
Ye darpan kaanch ka gola kaatkar nahi bante. Samtal kaanch ko ghiskar aur chamkaakar mod diya jaata hai aur phir ek paraavartak parat, jaise aluminium ki patli parat, chadhaayi jaati hai. Baahari mudi sateh par parat se avtal darpan, andar ki sateh par parat se uttal darpan banta hai.
Inhe pehchaanna
Dono darpan mez par seedhe rakho aur aankh unke star par rakhkar bagal se dekho (Activity 10.2): ek sateh andar dhansti hai aur doosri baahar uthti hai. Pratibimb bhi pehchaan dete hain. Darpanon ko khada karke saamne 3–4 cm par ek chhota khilauna rakho, phir use dheere-dheere door le jaao (Activity 10.3).
- Avtal darpan mein paas ka khilauna seedha aur bada dikhta hai. Door jaane par pratibimb ulta ho jaata hai, pehle bada phir chhota hota jaata hai.
- Uttal darpan mein khilauna hamesha seedha aur chhota dikhta hai, aur door jaane par thoda aur chhota.
- Samtal darpan mein ye hamesha seedha aur barabar size ka hota hai.
Teeno darpan paarshv parivartan dikhaate hain, yaani baayaan-daayaan badal dete hain.
Milaana aur failaana
Mude darpan par padne wali har kiran paraavartan ke niyam maanti hai, par mod poori kirnpunj ko badal deta hai. Avtal darpan se lauti samaanaantar kirnein paas aati hain, yaani milti hain; uttal darpan se lauti kirnein failti hain (Activity 10.6). Isliye Suraj ki or kiya avtal darpan dhoop ko ek chhote, bahut garam bindu par ikattha kar sakta hai (Activity 10.7), jo solar cooker aur saur bhatti ka siddhaant hai.
Kahan istemaal hote hain
Avtal darpan torch aur gaadi ki headlight ki roshni ko tez kirnpunj banaate hain; daanton ke paas rakha dentist ka darpan bada drishya deta hai; aur zyaadatar aadhunik doorbeenein ek bade avtal darpan se prakaash ikattha karti hain. Uttal darpan gaadiyon ke side-view mirror, tez modon aur chauraahon par suraksha darpan, aur badi dukaanon mein nigraani darpan hain, kyunki unke seedhe pratibimb chauda kshetra dikhaate hain.
Side-view mirror kyon chetaata hai
Uttal side-view mirror mein dekhne wala driver peechhe ki poori lane dekhta hai, yahi iska fayda hai. Par kyunki darpan har gaadi ko chhota dikhaata hai, sach mein paas khadi car door lagti hai. Isliye kai gaadiyon ke darpan par likha hota hai ki cheezein dikhne se zyada paas hain, aur lane badalne se pehle mudkar dekhna seekhna padta hai.
Aage paraavartan ke niyam aur lens kya hai padho, ya Chapter 10 ke notes aur NCERT solutions dekho.
Practice karo
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Chamakte chammach ka peechhe ka hissa kya banta hai?
Jawab dekho
Jawab: (b) uttal darpan
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Torch ke reflector kaun se hote hain?
Jawab dekho
Jawab: (c) avtal darpan
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Ek darpan hamesha chhota, seedha pratibimb deta hai. Ye hai:
Jawab dekho
Jawab: (c) uttal
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Bina chhue avtal aur uttal darpan ko kaise pehchaanein?
Jawab dekho
Jawab: Unhe mez par seedha rakhkar aankh ke star se bagal se dekho: avtal ki sateh andar dhansti hai aur uttal ki baahar ubharti hai. Ya pratibimb dekho: uttal hamesha chhota, seedha pratibimb dikhaata hai, jabki avtal paas se bada aur door se ulta.
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Pahaadi sadakon ke tez modon par uttal darpan kyon lagaaye jaate hain?
Jawab dekho
Jawab: Uttal darpan samtal darpan se kahin zyada chaude kshetra ka seedha pratibimb dikhaata hai, isliye dono taraf se aate driver mod ke peechhe ki gaadiyaan dekh sakte hain aur takkar se bach sakte hain.
Students ke sawal
Golaakaar darpan kya hai?
Aisa darpan jiski paraavartak sateh khokhle gole ke hisse ki tarah mudi ho. Chamakti taraf andar mudi ho to avtal darpan, baahar ubhri ho to uttal darpan. Ye kaanch ko ghiskar aur chamkaakar mod banaakar, phir ek taraf aluminium jaisi parat chadhaakar banaaye jaate hain.
Avtal darpan kaisa pratibimb banaata hai?
Ye doori par nirbhar hai. Vastu bahut paas ho to pratibimb seedha aur vastu se bada hota hai. Vastu door jaane par pratibimb ulta ho jaata hai; pehle bada aur phir chhota hota jaata hai.
Side-view mirror ke liye uttal darpan kyon lagaate hain?
Ye hamesha seedha pratibimb deta hai, aur baahar ubhra hone se peechhe ki sadak ka samtal darpan se kahin chauda hissa dikhaata hai. Pratibimb chhote hote hain, isiliye chetaavni likhi hoti hai ki cheezein dikhne se zyada paas hain.
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