3. i) The angle of incidence is equal to angle of reflection. ii) The incident ray, the normal and the reflected ray lie on the same plane.

9. i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. ii) The ratio of sine of angle of incidence to the sine of angle of refraction is a constant. This law is also called Snell’s law.

10. MEDIUMINDEX Air1 Water1.33 Ice1.31 Alcohol1.36

13. Object position Image positionImage sizeNature of image At InfinityAt F 2 DiminishedReal & Inverted Behind 2F 1 B/W F 2 &2f 2 SmallReal & Inverted At 2f 1 At 2F2SameReal & Inverted Between F And 2F Beyond 2F 2 MagnifiedReal & Inverted At F1At InfinityHighly Magnified Real & Inverted B/W The Pole (P) And F 1 Same Side Of Lens MagnifiedVirtual And Erect

14. Object position Image position Image sizeNature of image At InfinityAt F 1 DiminishedVirtual And Erect B/W O & Infinity Between O And F 1 SmallVirtual And Erect

15. Class X-C Sakshi Gupta