In an activity to find the image characteristics formed by the concave mirror, write the required materials and procedure.
Answers
Answer:
→AIM :
To determine the focal length of:
Concave mirror
Convex lens by obtaining the image of a distant object.
→ THEORY :
How to find focal length of concave mirror?
Following are the ways to obtain the focal length of the concave mirror:
- A concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of light.
- The light rays coming from a distant object can be considered to be parallel to each other.
- If the image formed is real, inverted and very small in size, then the parallel rays of light meet the point in the front of the mirror.
- The image formed by the convex lens is real and can be obtained on the screen.
- f is used to denote the difference between the principal axis P and the focus F of the concave mirror.
→ MATERIALS REQUIRED :
- A concave mirror
- A measuring scale
- A screen holder
- A mirror holder
- A mirror stand
→ PROCEDURE :
The distance between the selected distinct object should be more than 50 ft.
The concave mirror placed on the mirror stand and the distant object should be facing each other.
The screen should be placed in front of the reflecting surface of the mirror. To obtain a clear, sharp image the screen should be adjusted.
Using a metre scale the distance between the concave mirror and screen can be determined. The distance is the same as the focal length of the given concave mirror.
→ PRECAUTIONS :
- The placing of the convex lens should be vertical.
- There should not be any hurdle between the rays of light from the object and the convex lens.
- To get a well illuminated and distinct image of the distinct object, the distant object should be well illuminated.
- The convex lens stand and the screen should be parallel to the measuring scale.
HOPE IT HELPS YOU !!
Answer:
The screen should be placed in front of the reflecting surface of the mirror. To obtain a clear, sharp image the screen should be adjusted. Using a metre scale the distance between the concave mirror and screen can be determined. The distance is the same as the focal length of the given concave mirror.