11. Danger signals are generally red as light
12. An air bubble inside water behaves as a
13. Total internal reflection can take place when light travels from
14. Which of these devices uses only convex lenses?
15. A cut diamond shines brilliantly due to
16. Total internal reflection cannot take place when light goes from
17. Sky is blue because
18. How is the refractive index of a substance related to the speed of light in air?
19. When a ray of light enters a glass slab, then
20. Reading glasses are made from which type of lenses?
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