1.

Assertion `:` The mirrorrs used in search lights are parabolic and not concave spherical. Reason `:` In a concave spherical mirrorr the image formed is always virtual.A. Both assertin and reason are true and reason is the correct explanation of assertionB. Both assertion and reason are true but reason is not the correct explanation of assertionC. Assertion is true but reason is flaseD. Both assertion and reason are false

Answer» Correct Answer - C
In search light an intense parallel beam of light is prouced.In case of parabolic mirror,.when source is at the focus beam, of light produced over the entire cross section is parallel beam.But in concave spherical mirror due to its large aperature marginal rays gives a divergfent beam.


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