Revision: Lenses Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 04 Lenses - Revision Quiz Test your understanding of Lenses here: 1 / 5 1) A lens is used to form an image of an object as shown below. What is the likely application this lens is being used for? telescope human eye classroom projector magnifying glass 2 / 5 2) Which of the following does not affect the focal length of a convex lens? object distance refractive index of the material making the lens material of the lens thickness of the lens 3 / 5 3) The following diagram shows an object O, placed next to a lens as shown below: At which position is the image likely to be found? C B A D 4 / 5 4) A simple projector uses a convex lens L to form a sharp, inverted and magnified image of an object O on a screen at S. If the screen is moved slightly further away from the lens to S' how should the lens be moved to form a sharp image on the screen at S'? The lens can be moved towards the screen or away from the screen to get a sharp image. The lens should be moved towards the screen. The lens should be moved towards the screen. Cannot tell from the information given. A sharp image can actually be formed by moving the lens in either direction: If the lens is moved towards the screen the images gets smaller.If the lens is moved away from the screen the images gets bigger. 5 / 5 5) When an object is placed 31 cm from a lens the image formed is real, inverted and diminished. When the object is placed 29 cm from the lens the image formed is real, inverted and enlarged. Which of the following is a possible focal length of the lens? 15 cm 60 cm 30 cm cannot be determined Your score is Restart quiz
