Question

What statement below best expresses the lens placement for a microscope? The object Is just Inside the focal length of the objective, the Image from the objective is just inside the focal length of the eyepiece. The object is just outside the focal length of the objective, the Image from the objective is just inside the focal length of the eyepiece. The object is just outside the focal length of the objective, the Image from the objective is just outside the focal length of the eyepiece. The object is just Inside the focal length of the objective, the Image from the objective is just outside the focal length of the eyepiece. The image created by the objective lens is (compared to the original object): Inverted, reduced inverted, enlarged upright, reduced upright, enlarged When you look in the eyepiece of the microscope, your eye Is looking at: A real image very close to your eye A real image near Infinity A virtual image near infinity A virtual image very close to your eye To Increase the angular magnification M of a microscope, you would want to: Increase the focal length of the objective, decrease the focal length of the eyepiece Increase the focal length of both lenses Decrease the focal length of the objective, increase the focal length of the eyepiece Decrease the focal length of both lenses

Answer 1

The following figure shows the image formation with microscope. Here, f, is the focal length of the objective and f, is the focal length of the eyepiece Object lens Eye lens object Eye fReal image f. Virtual image From the above ray diagram, the object is just outside the focal length of the objective and the image formed by the objective is just inside the focal length of the eyepiece Hence, the correct option is (b). It is clear from the ray diagram that the image formed by the objective is inverted and enlarged Hence, the correct option is (b). When look in the eyepiece of the microscope, eye is looking at a virtual image near infinity Hence, the correct option is (c) The angular magnification of a microscope is given as, From the above equation, the angular magnification of a microscope can be increased by decreasing the focal length of both the lenses Hence, the correct option is (d)