Rules of Ray Diagram for Representation of Images Formed
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Draw ray diagrams showing the image formation by a concave mirror when an object is placed at the center of the curvature of the mirror.
To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always?
Under which of the following conditions a concave mirror can form an image larger than the actual object?
When the object is kept at a distance equal to its radius of curvature
When an object is kept at a distance less than its focal length
When an object is placed between the focus and center of curvature
When an object is kept at a distance greater than its radius of curvature
Total internal reflecting mirrors are preferred over plane mirrors because
- True
- False
- Used as shaving mirrors
- Used in headlights of vehicles.
- Used as rear-view mirrors.
- Used in search-lights.
- Centre of curvature
- Origin
- Focus
- Optical centre
If 3 concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principle axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?
at C
At F1, F2& F3
at P1, P2& P3
at F2 only
- at focus
- at centre of curvature
- at infinity
- within focus
- 25 cm away
- 25 cm towards
- 50 cm away
- 50 cm towards
- Travels away from normal.
- It passes through focus after reflection.
- It reflects towards the pole of the mirror
- It is reflected back along the normal.
![1774022_551ad6069506406395ee7acd85a62cb7.png](https://search-static.byjusweb.com/question-images/toppr_ext/questions/1774022_551ad6069506406395ee7acd85a62cb7.png)
- Used as shaving mirrors
- Used in search-lights.
- Used in headlights of vehicles.
- Used as rear-view mirrors.
- It reflects towards the pole of the mirror
- Travels away from normal.
- It is reflected back along the normal.
- It passes through focus after reflection.
Match the following:
Column 1 | Column 2 |
---|---|
The centre of a sphere of which a curved mirror is a part. |
principle focus |
A point midway between the pole and centre of curvature of a curved mirror. |
pole |
The mid point of a spherical mirror. |
centre of curvature |
An image of an object which cannot be taken on screen. |
diffused reflection |
A phenomenon due to which light rays on reflection move in different directions. |
virtual image |
A phenomenon due to which rays of light change their path on passing through another medium.
|
mirage |
The ratio between the velocity of light in vacuum or air to the velocity of light in some other medium. |
periscope |
An angle of incidence for which angle of refraction is 90°. |
refractive index |
A simple device used to see above the heads of crowd. |
critical angle |
Total internal reflection taking place in hot deserts. |
refraction |
- focus
- centre of curvature
- within focus
- Infinity
- Travels away from normal.
- It is reflected back along the normal.
- It reflects towards the pole of the mirror
- It passes through focus after reflection.
- Used in headlights of vehicles.
- Used in search-lights.
- Used as shaving mirrors
- Used as rear-view mirrors.