In question 118, if `m_(1)` and `m_(2)` are the magnifications for two positions of the lens, then

In the displacement method a conves lens is placed in between an object and a screen. If the magnificaiton in the two position are m_(1) and m_(2) ( m_(1) gt m_(2) ), and the distance between the two positions of the lens is x, the focal length of the lens is

If in compound microscope m_(1) and m_(2) be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be

If in compound microscope m_1 and m_2 be the linear magnification of the objective lens and eye lens respectively, then what is the magnifying power of the microscope ?

Assertion: In displacement method of finding focal length of a convex lens its magnification in one position of lens is +2, then magnification in another position of lens should be -1/2. Reason:This method can't be applied for a concave lens.