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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
A search light produces an intense parallel beam of light. This requires a reflector of large aperture. When a sources are placed at the focus of a large concave mirror, only the paraxial rays (not the marginal rays) are reflected as parallel beam. But when a source is placed at the focus of parabolic mirror all the rays are reflected as an intense parallel beam.
Reason is wrong as concave mirror can produce both real and virtual image.

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Similar questions

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

H_{2}

H e

(1 + \frac{P b}{R T})

H_{2}

H e

{SiO}_{2}

{CaCO}_{3}

CaO

{CaCO}_{3}

{SiO}_{2}

180^{\circ}

i = 45^{\circ}

20 cm

20 cm

20 cm

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