Question

10. Which gas is liberated when Zinc granules are added to Dil Hydrochloric acid?
11. Snell's law
A.nn. Sin i = n2. Sinn
B. n1. Sin r = n2. Sin i
C. n. n2 = Sin i. Sin r
D. n/n2 = Sin i / Sin
12. What do we call the phenomenon that the speed of light changes when medium changes
13. Write Lens formula,
14. Concepts :
(i) Dioptre is the unit for Lens power.
(ii) Normal least distance of distinct vision is 2cm
(iii) Normal angle of vision is 60°
Choose the correct answer :
A. (i) and (ii) are false
B. (i), (ii) and (iii) are correct
C. (i), (iii) and (iii) are false
D. only (i) and (ii) are correct​

Answer 1

When light enters from one medium to another, its speed and direction changes. This phenomenon is called refraction.