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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
6.
A combination of two thin lenses of the same material with focal length 
and 
arranged on a common axis minimizes chromatic aberration. If the distance between them is
and arranged on a common axis minimizes chromatic aberration. If the distance between them is
7.
When light travels from one medium to the other of which the refractive index is different, then which of the following will change
8.
The astronomical telescope consists of objective and eye-piece. The focal length of the objective is
9.
If 
denotes a unit vector along incident light ray, 
a unit vector along refracted ray into a medium of refractive index 
and 
unit vector normal to boundary of medium directed towards incident medium, then law of refraction is
denotes a unit vector along incident light ray, a unit vector along refracted ray into a medium of refractive index and unit vector normal to boundary of medium directed towards incident medium, then law of refraction is
10.
The resolving power of a telescope depends on