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1.
At the time of total solar eclipse, the spectrum of solar radiation would be
2.
If the critical angle for total internal reflection from a medium to vacuum is 
, the velocity of light in the medium is
, the velocity of light in the medium is
3.
Sun subtends an angle of 
at the centre of curvature of a concave mirror of radius of curvature 15 m. The diameter of the image of the sum formed by the mirror is
at the centre of curvature of a concave mirror of radius of curvature 15 m. The diameter of the image of the sum formed by the mirror is
4.
The chromatic aberration in lenses becomes due to
5.
The separation between two microscopic particles is measured 
and 
by two different lights of wavelength 
and 
respectively, then
and by two different lights of wavelength and respectively, then
6.
In a compound microscope, the intermediate image is
7.
In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are 
and 
respectively. The condition for getting deviation without dispersion when the two prisms are combined is
and respectively. The condition for getting deviation without dispersion when the two prisms are combined is
8.
In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of 
. The ratio of the frequency of the first beam to the frequency of the second beam is
. The ratio of the frequency of the first beam to the frequency of the second beam is
9.
Figure shows a cubical room 
with the wall 
as a plane mirror. Each side of the room is 
. We place is camera at the midpoint of the wall 
. At what distance should the camera be focused to photograph an object placed at 
with the wall as a plane mirror. Each side of the room is . We place is camera at the midpoint of the wall . At what distance should the camera be focused to photograph an object placed at
10.
Fraunhoffer spectrum is