Answer to Question #51841 in Optics for Samuel

Question

1 Diopter is the unit of ? a) linear magnification b) power of lens c) inverse of object distance from lens d) inverse of image distance from lens
2 In an experiment involving the convex lens, , which of the following is NOT correct? a) images must always be sharply focused b) the tip of object pin must be at the same height as the centre of lens c) images obtained must always be magnified d) parallax error must be avoided
3 Describe the image of a candle positioned 20cm in front of a concave mirror of focal length 30cm? a) virtual, inverted, 12cm behind mirror and magnified 3 times b) real, inverted, 12cm in front of mirror and diminished 3 times c) virtual, erect, 60cm behind mirror and magnified 3 time d) real, erect, 60cm in front of mirror and diminished 3 times