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A concave mirror of radius of curvature 20 cm forms image of the sun. The diameter of the sun subtends an angle 1° on the earth. Then the diameter of the image is (in cm)
  • a)
    2π/9
  • b)
    π/9
  • c)
    20
  • d)
    π/18
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A concave mirror of radius of curvature 20 cm forms image of the sun. ...
Given: A concave mirror of radius of curvature 20cm forms image of the sun. The diameter of the sun subtends an angle 1o on the earth. 
To find the diameter of the image
Solution:
As sun is more far from the earth,
Then we take u = infinite
Radius of curvature, R=−20cm
Focal length,
From the mirror formula
d = π/18
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Most Upvoted Answer
A concave mirror of radius of curvature 20 cm forms image of the sun. ...
The diameter of the sun subtends an angle of 1 degree at the concave mirror.
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A concave mirror of radius of curvature 20 cm forms image of the sun. The diameter of the sun subtends an angle 1° on the earth. Then the diameter of the image is (in cm)a)2π/9b)π/9c)20d)π/18Correct answer is option 'D'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A concave mirror of radius of curvature 20 cm forms image of the sun. The diameter of the sun subtends an angle 1° on the earth. Then the diameter of the image is (in cm)a)2π/9b)π/9c)20d)π/18Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A concave mirror of radius of curvature 20 cm forms image of the sun. The diameter of the sun subtends an angle 1° on the earth. Then the diameter of the image is (in cm)a)2π/9b)π/9c)20d)π/18Correct answer is option 'D'. Can you explain this answer?.
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