Question 8: Ray Optics

Question

Assertion : The mirror used in search lights are parabolic and not concave spherical.
Reason : In concave spherical mirror, the image formed is always virtual.

Accepted Answer

In search lights, an intense parallel beam of light is produced. In case of parabolic mirror, when source is at the focus beam of light produced over the entire cross-section is a parallel beam. But in concave spherical mirror due to its large aperture marginal rays gives a divergent beam.

Answer

Both assertion and reason are true and reason is the correct explanation of assertion

Answer

Both assertion and reason are true but reason is not the correct explanation of assertion

Answer

Assertion is true but reason is false

Answer

Both assertion and reason are false.

Ray Optics

Assertion : The mirror used in search lights are parabolic and not concave spherical. Reason : In concave spherical mirror, the image formed is always virtual.

Choose the correct answer: