Advertisements
Advertisements
प्रश्न
An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the positions of the original and final images seen in the mirror is ______.
पर्याय
2 cm
4 cm
10 cm
22 cm
Advertisements
उत्तर
An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the positions of the original and final images seen in the mirror is 4 cm.
APPEARS IN
संबंधित प्रश्न
When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.
State two factors on which the lateral displacement of the emergent ray depends.
Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. State whether the bending of pencil will increase or decrease if water is replaced by another liquid which is optically more dense than water. Give reason for your answer.
A vertical ray of light strikes the horizontal surface of some water:
- What is the angle of incidence?
- What is the angle of refraction?
The depth of a pond when seen from above appears to be less.
When a ray of light travels from water to air, it bends ............. the normal.
When a ray of light travels from air to glass, it bends .......... the normal.
We can see the sun even when it is little below the horizon because of ______.
What is atmospheric reflection? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position.
The size of image of an object by a convex lens of focal length 20 cm is observed to be reduced to `1/3` rd of its size . Find the distance of the object from the optical centre of the lens .
Light changes its direction when going from one transparent medium to another transparent medium. This is called _______.
State whether true or false. If false, correct the statement.
The angle of deviation depends on the refractive index of the glass.
Which object use the reflection of light?
Light travels fastest in a vacuum. Why?
Under what circumstances there won’t be any refraction of light when it enters from one medium to another?
The ray that enters the second medium after crossing the boundary is called the:
According to the second law of refraction, for a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction:
The constant \[\frac{\sin i}{\sin r}\] for a given pair of media is called the:
