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Anil and his friends were excited about the news of tomorrow’s solar eclipse. Anil convinced
his friends to witness the eclipse. Anil told them that looking at the sum directly or even into a
mirror reflecting sunlight may damage their eyes. So Anil narrated the method to witness to
natural phenomenon in the following ways:

(i) Hold a concave mirror in hands and direct its reflecting surface towards the sun.
(ii) Direct the light reflected by the mirror on to a sheet of paper held close to the mirror.
(iii) Move the sheet of paper back and forth gradually until a bright, sharp spot of light found
on the paper sheet, hold the mirror and the paper in the same position for a few minutes.


Read the above information and answer the following:
(a) What is the separation between the concave mirror and the paper sheet having a bright,
sharp spot of light in hands?
(b) What value(s) is/are shown by Anil?
(c) Draw the ray diagram used while observing the bright, sharp spot of light in above activity.
[Value Based Question]

(a) Here, the rays coming from the sum are coming parallel to the principal axis of the concave
mirror, so it will focus the image on its principal focus. Hence the separation between the
concave mirror and the paper sheet will be equal to the focal length of the concave mirror.
(b) Values shown by Anil are:
(i) Togetherness, (ii) Friendship, (iii) Positive attitude
(c) Necessary ray diagram: when the object is placed between pole and mirror.
hope this helps.
 
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View Full Answer
c) when object is placed between pole and focus of mirror
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Wow
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Ole is present
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(c) when the object is at infinity
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Please explain it more further,, I am not able to get it. Kindly expand the information of Part (a).
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Pls say in Ray diagram where is object placed at infinity or between p and f
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c) when the object is placed at infinity
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(c)
 
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yes
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Hi
 
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arey yar what is this yar explain more yar 7
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i had the same question for my test
please answer it
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The ray diagram of this question is the object is at infinity it focuses on principal focus
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a) Here, the rays coming from the sun are coming parallel to the principal axis of the concave
mirror, so it will focus the image on its principal focus. Hence the separation between the
concave mirror and the paper sheet will be equal to the focal length of the concave mirror.

(b) Necessary ray diagram: when the object is placed between pole and mirror.
hope this helps.

 
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a) Here, the rays coming from the sum are coming parallel to the principal axis of the concave
mirror, so it will focus the image on its principal focus. Hence the separation between the
concave mirror and the paper sheet will be equal to the focal length of the concave mirror.

(b) Necessary ray diagram: when the object is placed between pole and mirror.
hope this helps.

 
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