In this image where the object is placed at the focus, the 2 reflected rays are parallel to each other. How then can we say that the image is highly magnified? The image must be of the same size as the rays are parallel and dont diverge. Please explain.
Asked by Shravan Hiremath | 25th Oct, 2014, 09:21: PM
In a concave mirror when an object is placed at Focus the image is formed at infinity.
In the given ray diagram , AB is an object placed at the focus F.The ray AD incident on the mirror parallel to the principle axis gets reflected along DF passing through the focus. The other ray AE appears to come from the centre of curvature C and hence it gets reflected back along EA. The two reflected rays DF and EA are parallel to each other and thus they form image only at very very far away from the mirror where both the rays would meet at a point.(Image is formed at the point where the rays reflected from the mirror meet). In this case the rays being parallel they would meet only at very large distance from the mirror and hence we consider that they form the image at infinity.
This image will be real , inverted and magnified. It will be magnified as the size of the image is measured from the principle axis to the point where both the parallel rays meet ( Here the meeting point is at infinity). Hence we say that the image id formed at infinity and is highly magnified
Answered by Jyothi Nair | 27th Oct, 2014, 08:54: AM
- distinguish between real image and virtual image
- write the rules for the formation of image by spherical mirrors
- An object is placed at a distance of 15 vm infront of a concave mirror whose focal length is 10 cm at what distance the image is formed? what are the properties of image?
- A spherical mirror produces an image of magnification -1.0 on a screen placed at a distance of 30 cm from the pole of the mirror. a) Write the type of mirror used. b) What is the focal length of this mirror? c) Calculate the object distance. d) What is the nature of the image formed? e) Draw the ray diagram to show the image formation.
- where should be the object placed in front of a concave mirror so as the magnification obtained is -2?
- about image formed by convex mirror
- An object of size 7.0 cm is placed at 27 cm infront of a concave mirror of focal length 18 cm. At what distance from a mirror should a screen be placed, so that a sharp focused image can be obtained?Find the size and the nature of the image.
- why at least two reflected rays are needed to form an image in a concave mirror?
- draw the path of incident ray in a convex mirror when incident ray is directed towards centre of curvature
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number