Question

A plane mirror is placed with its plane and angle 30 degree with the y-axis plane of the mirror is perpendicular to its plane and the length is of mirror is 3 metre and intercept moving along x-axis starting from understand. With speed 2 centimetre per second the duration of time for vision in 2 seconds its on images in the mirror is

Answer 1

Answer:

Insect is able to see its image for t = 300 s

Explanation:

As we know that plane mirror length is L = 3 m

Plane mirror is inclined at an angle of 30 degree with Y axis

So here we will say that insect will start to see its image when he is at perpendicular position from the end of the mirror

so we will have

$\frac{3}{x} = sin30$

$x = 6 m$

now from this position till the end of the mirror the insect is able to see its image

Now we will have

$d = 6 m = 600 cm$

$v = 2cm/s$

so the total time for which insect is able to see its image is given as

$t = \frac{600}{2}$

$t = 300 s$

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Topic : image formation in plane mirror

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