Question

Q.4 (a) Write down the formula that relates the object and image distance to the focal length for a concave, spherical mirror and identify all terms used. [4 marks]

(b) Define the terms paraxial ray and spherical aberration of a concave mirror. How can the shape of the mirror be adjusted to eliminate this aberration? [3 marks]

(c) A certain concave spherical mirror has a radius of curvature of 10.0 cm. A box with height of 3.0 cm is located 15 cm in front of the mirror.

(i) Draw an accurate ray diagram to show where the image of the box is located. [3 marks]

(ii) Is the image real or virtual? [2 marks]

(iii) Estimate the height of the box from the drawing. [2 marks]

(iv) If the box has a width of 1.5 cm, what will be the width of the image? [2 marks] (v) Use the mirror equation to calculate where the box should be placed so that a virtual image is produced at a position which is 2.0 cm behind the mirror. [4 marks]

Answer 1