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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : When a concave mirror is held under water, its focal length will increase.
Reason : The focal length of a concave mirror is independent of the medium in which it is placed.
  • a)
    Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
  • b)
    Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
  • c)
    Assertion (A) is true but reason (R) is false.
  • d)
    Assertion (A) is false but reason (R) is true.
  • e)
    Both Assertion and Reason are false.
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Direction: In the following questions, a statement of assertion (A) i...
Assertion (A) is false but reason (R) is true. Focal length is the property of mirror and is independent of the medium in which it is placed.
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Direction: In the following questions, a statement of assertion (A) i...
Assertion: When a concave mirror is held under water, its focal length will increase.


Reason: The focal length of a concave mirror is independent of the medium in which it is placed.

The correct option is D, Assertion (A) is false but reason (R) is true.

Explanation:

A concave mirror is a spherical mirror in which the reflecting surface is curved inwards. When a concave mirror is held under water, its focal length does not increase, it decreases. The assertion is false.

The reason is true because the focal length of a concave mirror is independent of the medium in which it is placed. The focal length of a concave mirror depends only on the radius of curvature of the reflecting surface and the refractive index of the surrounding medium. It is given by the formula:

1/f = (2/R) - (n2/n1)

where f is the focal length, R is the radius of curvature, n1 is the refractive index of the medium in which the mirror is placed, and n2 is the refractive index of the surrounding medium.

Therefore, the assertion is false because the focal length of a concave mirror decreases when it is held under water, but the reason is true because the focal length of a concave mirror is independent of the medium in which it is placed.
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When a concave mirror is held under water, its focal length will increase.Reason : The focal length of a concave mirror is independent of the medium in which it is placed.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.e)Both Assertion and Reason are false.Correct answer is option 'D'. Can you explain this answer?
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When a concave mirror is held under water, its focal length will increase.Reason : The focal length of a concave mirror is independent of the medium in which it is placed.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.e)Both Assertion and Reason are false.Correct answer is option 'D'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When a concave mirror is held under water, its focal length will increase.Reason : The focal length of a concave mirror is independent of the medium in which it is placed.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.e)Both Assertion and Reason are false.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When a concave mirror is held under water, its focal length will increase.Reason : The focal length of a concave mirror is independent of the medium in which it is placed.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.e)Both Assertion and Reason are false.Correct answer is option 'D'. Can you explain this answer?.
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