Advertisements
Advertisements
प्रश्न
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be ______.
पर्याय
1 m/s
2 m/s
4 m/s
8 m/s
Advertisements
उत्तर
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be 4 m/s.
Explanation:
- In a plane mirror, the relative speed of the image is twice the speed of the object.
- So, if the car is moving at 2 m/s, the image of the truck will appear to approach the driver at 4 m/s.
APPEARS IN
संबंधित प्रश्न
Explain the difference between a plane mirror, a concave mirror, and a convex mirror with respect to the type and size of the images produced.
If an object is placed between two mirrors which are parallel to each other, the number of images formed is ______.
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is ______.
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
Which of the following can be used to form a real image?
The ______ is an optical device with a polished surface that reflects the light falling on it.
Curved mirrors form the perfect image of an object.
Assertion: The mirrors used in searchlights are parabolic and not concave spherical.
Reason: In a concave spherical mirror the image formed is always virtual.
Car rearview mirrors carry a warning message that “objects in the rearview mirror are closer than they appear”. Why do you think this is so?
Visit a laughing gallery in some science centre, or a science park or a village mela. You will find some large mirrors there. You can see your distorted and funny images in these mirrors. Try to find out the kind of mirrors used there.
