Question
Physics Question on Ray optics and optical instruments
In achromatic combination of lenses is formed by joining :
A
1 convex lens and 1 plane mirror
B
1 convex, 1 concave lens
C
2 convex lenses
D
2 concave lenses
Answer
1 convex, 1 concave lens
Explanation
Solution
If two or more lenses are combined together in such a manner that this combination provides a image of different colours at the same point and of the same size. Then this property is known as achromatism for this concave and convex are used.