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Q.

Figure shows an object is located at point P, 0.25 meter from a concave mirror with principle focus F the focal length of the mirror 0.10. How does the image distance change if the object is moved from point P towards point F

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a

its distance from the mirror increases

b

its distance from the mirror decreases

c

the size of image increases

d

the size of the image decreases

answer is C.

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Detailed Solution

we know for u > 2f, v will be in between f and 2 f

Given f = 0.10 m,   u = 0.25 m

As we move the object towards f we get

(i) size of image increases

(ii) distance of image increases

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