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The origin of x and y coordunates is the pole of a concave mirror of focal length 20 cm. The x axis is the optical axis with x>0 being the real side of mirror. A point object(25cm,1cm) is moving with a velocity 10 cm/sec in positive x direction. Find velocity of image?..plz help

The origin of x and y coordunates is the pole of a concave mirror of focal length 20 cm. The x axis is the optical axis with x>0 being the real side of mirror. A point object(25cm,1cm) is moving with a velocity 10 cm/sec in positive x direction. Find velocity of image?..plz help

Grade:12

4 Answers

Suhita singh
4 Points
2 years ago
1/v+1/u=1/f
for concave mirror
1/v+1/-25=1/-20
V=-100cm
Now magnification=-v/u=-(-100/-25)=-4
Now velocity of image=-m×m×velocity of object
therefore V(image)=-(-4×-4)×10=160cm/s(-x axis direction)
Adam
10 Points
2 years ago
You have only given x coordinate answer for the question please Give answer for y coordinate of asked question also?
Suhita singh
4 Points
2 years ago
Since y-axis position coordinate is not changing and their is no velocity of object in y- axis therefore velocity of image in y-axis direction is zero
Adam
10 Points
2 years ago
U is changing ..therfore height of objecy is changing...and hence there will be velocity component in vertucal direction

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