1.  An achromatic convergent doublet has power of +2D. If power of convex lens is + 5D, then ratio of the dispersive powers of a convergent and divergent lenses will be

      (a) 3 : 5                      (b) 2 : 5

      (c) 2 : 3                      (d) None of these

Answer: ________

2.  An object is placed in front of a convex mirror at a distance of 50cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and plane mirror is 30cm, it is found that the images formed by two mirrors are along same line. Radius of curvature of mirror will be

      (a) 12.5cm                  (b) 25cm

      (c)  cm                     (d) 18cm

Answer: ________

3.  Figure given below shows a beam of light converging at point P. When a concave lens of focal length 16cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to

      (a) 12cm                     (b)  cm

      (c)  cm                     (d)  cm

Answer: ________

4.  A luminous object is placed at a distance of 30cm from the convex lens of focal length 20cm. On the other side of the lens, at what distance from the lens, a convex mirror of radius of curvature 10cm be placed in order to have an upright image of the object coinciding with it

      (a) 12cm                     (b) 30cm

      (c) 50cm                     (d) 60cm

Answer: ________