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1.
What cause chromatic aberration?
2.
Two plane mirrors inclined to each other at an angle 
what is the number of image formed?
what is the number of image formed?
3.
In an optics experiments, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance 
and the image distance 
from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 
with the 
-axis meets the experimental curve at 
The coordinates of 
will be
and the image distance from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of with the -axis meets the experimental curve at The coordinates of will be
4.
A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will
5.
A person cannot see properly beyond 2 m. Power of the lens is