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प्रश्न
Why do automobile drivers prefer convex mirror as a rear vew mirror? Illustrate your answer.
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उत्तर
A convex mirror always forms a small and upright image between pole and focus. That means in small area of mirror drivers can see all the traffic coming from behind.
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संबंधित प्रश्न
State two uses of a plane mirror.
Figure shows an incident ray AO and the normal ON on a plane mirror. The angle which the incident ray AO makes with mirror is 30°. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.
The diagram below in figure shows an object XY in front of a plane mirror MM1 . Draw on the diagram, path of two rays from each point X and Y of the object to show the formation of its image .
An object 3 cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a concave mirror. Calculate:
- the position of image
- focal length of the concave mirror.
An object 1.5 cm high when placed in front of a concave. the mirror produces a virtual image 3 cm high. If the object is placed at a distance of 6 cm from the pole of the mirror, calculate:
- the position of the image
- the focal length of the mirror.
Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
Match the following:
| 1. | Vegetable oil | a. | Transparent |
| 2. | Glass | b. | Translucent |
| 3. | Wood | c. | Waterproof |
| 4. | Aluminum foil | d. | Opaque |
Materials which reflect the light well are called ______.
A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
