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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