an object is placed at a large distance in front of a concave mirror with radius of curvature 40cm. where will the image be formed ?
i know that there is data missing, but this is how it has been asked in S.Chand. in the solution the answer has been given as 20cm. i would like to know how they have arrived at that answer
Answers
Answered by
37
see friend the answer is 20 only.As the object is placed at a large distance and radius of curvature is 40cm,that means object is at infinity and also we know that R =2f. So by solving u will get 20cm as the image will form at focus.
Answered by
1
Answer:
The image formed will be at focus and the distance of image will be 20cm.
Explanation:
Focal length:
- The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus.
Image formed:
- An object is placed at a large distance in front of concave mirror means the object is at infinity. When the object is at infinity then the image is formed at focus.
- Also radius of curvature is equal to the twice of focal length.
R = 2f
- So, to find the distance of image formed it is enough to find the focal length.
Given Radius of curvature R = 40cm
then f = R/2
f = 40/2
f = 20cm
Hence the image is formed at focus and the focal length is 20cm.
Know more about Concave and Convex lens:
https://brainly.in/question/9733260?referrer=searchResults
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