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Standard XII

Physics

Uses of Convex Mirrors

Assertion :Fo...

Question

Assertion :For observing traffic at our back, we prefer use of a convex mirror. Reason: A convex mirror has a much larger field of view than a plane mirror or a concave mirror.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The nature of the image formed due to a convex mirror does not change with changing distance of the object. It is always virtual, erect and smaller. Therefore convex mirror are used for back view. It can cover a large field of vision.

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Similar questions

Q. Assertion: Focal length of a convex mirror is

20 cm

. If a real object is placed at a distance of

20 cm

from the mirror, its virtual, erect and diminished image will be formed.
Reason: If a virtual object is placed at

20 cm

distance behind the convex mirror, its image is formed at infinity.
Choose the correct option based on it.

Q. Choose the correct option for the given assertion and reason.
Assertion: Two plane mirrors kept at right angle deviate any ray of light by

180^{\circ}

after two successive reflections.
Reason: The above condition is satisfied only for angle of incidence,

i = 45^{\circ}

Q. Assertion: The compressibility factor for

H_{2}

and

H e

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

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

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