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Paraavartan aur Darpan ke Pratibimb

Class 7 Science · Chapter 11: Roshni: Chhaaya aur Paraavartan · NCERT Curiosity section 11.5–11.6

Seekho

Meher dhoop mein chamakti steel ki thaali pakadti aur chhaaya wali deewaar par tez dhabba naachta. Thaali jhukaane se dhabba khisakta. Chamakti sataah ya darpan roshni ki disha badalta: ye paraavartan. Kanghi ki jhiri se kaagaz par patli kiran banaakar wo dekhti kiran darpan se nayi disha mein lautti.

Samtal darpan ke saamne pen ka peechhe ek jodiwaala dikhta: uska pratibimb. Pratibimb vastu jitna same maap, seedha, aur darpan ke peechhe utni door jitni vastu aage. Ise screen par nahi pakda ja sakta.

Ishaan baayaan haath uthaata; pratibimb daayaan. Ye baayein-daayein ki adla-badli paarshv vyutkraman, isliye ambulance ke aage AMBULANCE ulte akshar mein: aage ke driver rear-view mirror mein sahi padhte. Kerala ki Aranmula Kannadi haath se bana dhaatu darpan, jaise kaanch se bahut pehle darpan bante the.

Explore: darpan pratibimb banaao.

  1. Akshar F darpan (dashed line) ke saamne. Uska pratibimb rango.

Yaad rakho

  • Paraavartan darpan ya chamakti sataah par roshni ki disha badalna.
  • Samtal darpan ka pratibimb same maap, seedha, utna peechhe jitna vastu aage, paarshv ulta, aur screen par nahi.

Quick check

Samtal darpan ke pratibimb ke baare mein kya sach NAHI?

  1. screen par pakda ja sakta
  2. seedha
  3. same maap
  4. paarshv ulta
Answer

screen par pakda ja sakta. Samtal darpan ka pratibimb darpan ke peechhe dikhta aur screen par nahi banta.

Socho

Kaunse bade akshar darpan mein bilkul waise hi dikhenge, aur kyun?

Ek answer

A, H, I, M, O, T, U, V, W, X, Y jaise, kyunki har ek mein khadi samamiti rekha, to baayaan-daayaan badalne se kuch nahi badalta.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.