1) 1.Which principle is the auto-collimation method based on? a) A) Refraction at a single surface b) B) Total internal reflection c) C) The formation of a real image that coincides with the object when the object is at the center of curvature d) D) Snell's Law 2) 2. In the auto-collimation method to find the focal length (f) of a convex lens, where should the optical needle be placed to coincide with its inverted image? a) A) At the focal point (F) b) B) At the center of curvature (2F) c) C) At infinity d) D) Between F and the optical center 3) 3.The spherometer is used to measure which parameter of the convex lens surface? a) A) Focal length b) Refractive index c) Radius of curvature d) Diameter 4) 4. What is the formula used with the spherometer to calculate the radius of curvature. a) b) c) d) R=l/h 5) 5.What type of image is formed when the object is placed at the focal point (F) of the convex lens/plane mirror combination in this experiment? a) A) Virtual and erect b) B) Real and inverted, at the same position as the object c) C) Real and enlarged d) D) No image is formed 6) 6.If the refractive index of the lens material is 1.5, and it is dipped in a liquid of refractive index 1.5, how will the lens behave? a) A) As a converging lens b) B) As a diverging lens c) C) As a plane glass plate d) D) The focal length will become negative. 7) 7.Which source of error is commonly mentioned in this experiment? a) A) Measuring the diameter of the lens b) B) Inaccurate measurement of ambient temperature c) C) Backlash error in the spherometer screws d) D) Not using a plumb line 8) 8.The auto-collimation method primarily helps in accurately determining the: a) A) Radius of curvature R b) B) Height difference h c) C) Focal length 𝑓 d) D) Distance between outer legs 9) 9.Why must the tip of the optical needle and the tip of its image be aligned without parallax? a) A) To ensure the image is magnified. b) B) To ensure the image is virtual. c) C) To confirm that the image is formed exactly at the same horizontal plane as the object, indicating accurate focal length measurement. d) D) To prevent the lens from moving.

JKC 11 Activity 1 .Refractive index of convex lens using spherometer and auto collimation method

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