1. If an object is placed 30 cm away from this
mirror, what will be the nature of image
formed?
2. When an object that is very far away is slowly
moved closer to a concave mirror, what will
be the change in size of image observed?
3. In which mirror, concave or convex, can you
observe the full image of a distant tree or
building?
4. An object is placed beyond the centre of
curvature of a concave mirror of focal length
20 cm. The image would be formed
a) beyond 40 cm
b) between 20-40 cm
c) between pole and 20 cm
d) at 20 cm
Answers
Answer:
Have you ever looked at yourself in the mirror and imagined that there is a whole other world on the other side of the glass with another version of you? Did you know that there is a whole “virtual” world on the other side of a mirror?
Plane mirrors
Let’s say you have a toy car, and it’s sitting in front of a regular bathroom mirror. The distance between the car and mirror is called the object distance, and it’s always positive. If you look at the image of the toy car in the mirror, it will appear to be the same distance behind the mirror as the real car is in front of the mirror, at the same height. It will also appear to be the same size as the real car. The image of the car looks like it’s behind the mirror (and the light we see does not directly emerge from the image), we say that the image is upright and virtual, and that the image distance is negative.
Answer:
1.if an object is placed at 30 cm in front of the mirror so as to obtain the real image. The image formed is real, inverted and is of the same size as the object
2.When the object is far from the mirror, the image is inverted and at the focal point. The image is real light rays actually focus at the image location). As the object moves towards the mirror the image location moves further away from the mirror and the image size grows (but the image is still inverted).
3.We know that a convex mirror forms a virtual and smaller image irrespective of position of the object. So, a full length image of a distant tall building can definitely be seen by using a convex mirror.
4.20 cm from mirror