Light - Reflection and refraction
light - Reflection and refraction Exercises Questions Page no 212 1. Which one of the following materials cannot be used to make a lens? a) Water b) Glass c) Plastic. d) Clay Ans:-( d ) Explanation :- Because clay is an opaque substance and it doesn't allow the light to pass through it. 2. The image formed by a concave mirror is observed to be virtual ,erect and larger than the object .Where should be the position of the object? a) Between the principal focus and the centre of curvature b) At the centre of curvature c) Beyond the centre of curvature d) Between the pole of the mirror and it's principal focus. Ans: -( d ) Explanation :- one and only condition that forms a virtual image using concave mirror is, the position of the object placed between pole and foc...