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Grade 10Wave Optics

A point object is moving a speed of 2m/s perpendicular to principle axis of a concave mirror of focal length 10 cm. When the object is at principle axis is at distance 15 cm from the mirror , the speed of the image will be

2 m/s

4 m/s

1 m/s

3 m/s

Question image for A point object is moving a speed of 2m/s perpendi

ankur

8 Years agoGrade 10

2 Answers

Adarsh

8 Years ago

Dear Ankur,

i am getting answer as 8m/s .

velocity of image = v²/u².du/dt and m = -v/u = 2 so velocity of image = 2 x 2 x 2 = 8m/s.

this is not given in your option

Thanks and Regards

Adarsh

Physics solver

6 Years ago

when object moves perpendicular to principal axis the velocity of image is given by

$v_i=mv_o$

if m is negative then image moves in opp direction of object’s motion.

$m={f\over f-u}$

m=-2

$v_i=-4m/s$

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