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1.
Which one of the following statements is true
2.
An object 
high is placed at a distance of 
from a concave mirror of radius of curvature 
. The size of the image is
high is placed at a distance of from a concave mirror of radius of curvature . The size of the image is
3.
At what distance from a convex lens of focal length 30 cm, an object should be placed, so that the size of the image be 
th of the object?
th of the object?
4.
A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focussed, through the liquid onto a mark on the table when the reading on the scale is 
. It is next focused on the upper surface of the liquid and the reading is 
. More liquid is added and the observations are repeated, the corresponding readings are 
and 
. The refractive index of the liquid is
. It is next focused on the upper surface of the liquid and the reading is . More liquid is added and the observations are repeated, the corresponding readings are and . The refractive index of the liquid is
5.
For a convex lens, if real image is formed the graph between 
and 
or 
is as follows
and or is as follows