List of top Physics Questions on Optical Instruments asked in JEE Advanced

A plano-convex lens is made of a material of refractive index $n$. When a small object is placed $30 \,cm$ away in front of the curved surface of the lens, and image of the double the size of the object is produced. Due to reflection from the convex surface of the lens, another faint image is observed at a distance of $10\, cm$ away from the lens. Which of the following statement (s) is (are) true?

In a compound microscope, the intermediate image is

An astronomical telescope has an angular magnification of magnitude 5 for far objects. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length $f_o$ of the objective and the focal length $f_e$ of the eyepiece are