1) 1.The main aim of the experiment is to find the ______ of a convex lens a) Weight b) Thickness c) Diameter d) Focal length 2) 2.What type of lens is used in this experiment? a) Concave lens b) Convex lens c) Plano convex lens d) cylindrical lens 3) 3.The displacement method requires a sharp, real, and inverted image to be formed on a...... a) Empty air b) Mirror c) Wall behind the object d) screen 4) 4. What is the condition for two distinct image positions (L₁ and L₂) to be found for a given object-screen distance D? a) D < f b) D = f c) D > 4f d) D = 2f 5) 5.What does 'x' represent in the formula f= D2-X2/4D ....... a) The distance between the two lens positions (L₁ and L₂) b) The object distance c) The distance between the object and the screen d) The image distance 6) 6.What should be ensured about the optical bench before starting the experiment? a) It should be warm to the touch. b) It should be made of glass. c) It should be horizontal. d) It should be brightly lit. 7) 7.Why is it useful to find a 'rough focal length' f{rough}at the beginning of the experiment? a) To help set the initial object-screen distance (D > 4f). b) To calculate the final answer immediately. c) To clean the lens. d) To know the exact diameter of the lens. 8) 8.How many sharp, real images can be formed on the screen by the convex lens for a fixed object-screen distance D (given D > 4f)? a) Two b) One c) Three d) None 9) 9.What kind of image is typically formed at the first lens position (L₁) in the displacement method when moving the lens from object towards screen? a) Real and magnified b) Real and same size c) Real and diminished d) Virtual and erect 10) 10.Which principle of light is fundamental to the displacement method, explaining why the object and image positions can effectively be interchanged? a) Principle of reversibility of light b) Dispersion of light c) Total internal reflection d) Reflection of light

JKC Experiment Focal Length of a Convex Lens by Displacement Method

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