Single Choice

A plane mirror is approaching you at a speed of $$10$$ cm/s you can see your image in it. At what speed will your image approach you?

A$$10$$ cm/s
B$$5$$ cm/s
C$$20$$ cm/s
Correct Answer
D$$15$$ cm/s

Solution

Suppose at any instant, plane mirror lies at a distance $$x$$ from the object. The image will be formed behind the mirror at the same distance $$x$$.
When the mirror shifts towards the object by distance $$'y'$$ the image shifts $$=x+y-(x-y)=2y$$
So speed of image $$=2\times $$speed of mirror
hence $$=2\times 10 =20 / m/s$$

SIMILAR QUESTIONS

Optics

A plane mirror: (i) can form real image of a real object (ii) neither converges not diverges the rays (iii) cannot form real image of a real object Choose the correct option or options.

Optics

A plane mirror is placed along positive x-axis facing along positive y-axis. The equation of a linear object is $$x=y$$. The equation of its image is?

Optics

Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

Optics

If the momentum of an electron is changed by P, then the de-Broglie wavelength associated with it changes by 0.5%. The initial momentum of an electron will be:

Optics

The light reflected by a plane mirror may form a real image .......... .

Optics

A plane mirror reflects, a pencil of light to form a real image. Then the pencil of light incident on the mirror is

Optics

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand

Optics

Draw a ray diagram to show the formation of image of an object placed between the pole and focus of a concave mirror . State the position, size and nature of the image

Contact Details