Chhaaya Banna

Class 7 Science · Chapter 11: Roshni: Chhaaya aur Paraavartan · NCERT Curiosity section 11.4

Seekho

Andhere kamre mein Zoya torch aur deewaar ke beech gatte ka taara pakadti: kaala taara-aakaar dhabba. Roshni seedhi chalti, to apaardarshi vastu use rokti, aur jahaan roshni nahi pahunchti wo chhaaya. Dekhne ko chahiye roshni ka srot, apaardarshi vastu aur screen (deewaar, farsh ya zameen).

Apaardarshi vastu kaali chhaaya, paarbhaasi halki, aur kuch paardarshi bhi halki si. Vastu ko torch ke paas laane se chhaaya badi; screen ke paas laane se chhoti aur saaf. Jhukaane se aakaar badalta. Vastu ka rang badalne se chhaaya ka rang nahi badalta.

Bahar tumhaari chhaaya subah-shaam lambi aur dopahar ke aas-paas sabse chhoti, jab Sooraj ooncha. Bharat mein chhaaya-kathputli ki samriddh parampara: Andhra Pradesh ki Tholu Bommalata, Karnataka ki Togalu Gombeyaata, Odisha ki Ravana Chhaya aur Kerala ki Tholpavakoothu deepak aur screen ke beech kati aakritiyon se kahaaniyan sunaati.

Explore: chhaaya ka kya hota?

Har kaam sort karo.

Yaad rakho

Chhaaya wahaan jahaan apaardarshi vastu roshni rokti; srot, vastu aur screen chahiye.
Chhaaya ka maap aur saafi sthiti par; chhaaya ka rang vastu ke rang par nahi.

Quick check

Torch band karne par gend ki chhaaya ka kya?

there is no shadow
it gets bigger
it turns red
it gets sharper

Answer

there is no shadow. Chhaaya ko roshni ka srot chahiye.

Socho

Ghadi ke bina chhaaya se samay kaise bata sakte?

Ek answer

Dhoop mein lakdi seedhi gaado aur alag ghanton par chhaaya ka nishaan lagao; din bhar chhaaya ki disha aur lambaai badalti, dhoop ghadi jaisi.

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.