Ray Optics and Optical Instruments - Result Question 46
48. An achromatic combination of lenses is formed by joining
[1995]
(a) 2 convex lenses
(b) 2 concave lenses
(c) 1 convex and 1 concave lens
(d) 1 convex and 1 plane mirror
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Answer:
Correct Answer: 48. (c)
Solution:
- (c) If two or more lenses are combined together in such a way that this combination produces images of different colours at the same point and of the same size, then this property is called ‘achromatism’. Concave and convex type of lenses are used for this combination.
