Question

Very Short Answer Questions 1. Which type of lenses are : (a) thinner in the middle than at the edges? (b) thicker in the middle than at the edges? 2. Give the usual name for the following: A point inside a lens through which the light passes undeviated. Which of the following ray diagram is correct for the ray of light incident on a lens shown in figure? What is focal length? a) The distance from the light source to the image b) The distance from the object to the centre of the lens c) The distance from the image to the centre of the lens d) The distance from the focal point to the centre of the lens 5. Which of the following statements are true (i) The principal focus of a converging lens is real. (ii) The principal focus of a diverging lens is virtual. (iii) The principal focus of a lens always lies on the principal axis. a) Only (i) and (ii) b) Only (ii) and (iii) Only (i) and (iii) d) (i), (ii) and (iii)l​

Answer 1

Answer:

1.a)concave lens

b)convex lens