When an object is placed at a distance of 27cm from a concave mirror, the size of the
image is three-fourth that of object.
i. Calculate the distance of image from the mirror?
ii. What will be the focal length of the mirror?
Answers
Answered by
1
Answer:
1= 20.25
Explanation:
I did not know the answer of the 2nd one
Answered by
1
The distance of image from the mirror is 20.25cm.
The focal length of the mirror is 11.57 cm.
Given:
Object distance, u= 27cm -(1)
Size of image to size of object, v/u = 3/4. -(2)
To find:
i) the distance of image from the mirror
ii) the focal length of the mirror
Answer:
The relation between focal length, object distance and image distance for a concave is mirror
1/f = 1/u + 1/v. -(3)
- From equation 1 and 2,
v = 3u/4 = 3(27)/4 = 20.25 cm
- Substituting equations 1 and 2 in 3,
1/f = 1/27 + 1/20.25
⇒1/f = 0.08642
⇒f = 11.57 cm
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