1)At least_____ light rays are required to locate the image formed by a lens.
2
2)What is the nature of an image formed by a concave mirror of focal length 10 cm for a real object placed 3 cm from the mirror?
Real and inverted
2) is wrong. Objects placed inside the focal length distance do not form real images.
1/d_o is larger than 1/f.
Try computing d_i for that one.
What type of lens was used in our activity as shown below?
To answer the first question, in order to locate the image formed by a lens, we need at least two light rays. These rays can be used to determine the position, size, and orientation of the image. One ray is traced parallel to the principal axis and then passes through the focal point (for converging lenses) or appears to come from the focal point (for diverging lenses). The other ray is traced through the center of the lens and continues in the same direction without bending.
For the second question, when a concave mirror with a focal length of 10 cm forms an image for a real object placed 3 cm from the mirror, the nature of the image is real and inverted. In this case, the image is formed on the same side as the object, and the height of the image is inverted compared to the object.