In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________

We combine two lenses, one is convex and other is concave having focal lengths /, and f2 and their combined focal length is F. Combination of the lenses will behave like concave lens, if

Which part is not included in the fiber-optic communication system?

What magnification level is referred to as High Power Objective

A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power isThe magnifying power of the other lens is:

The magnification produced by the objective lens and the eye lens of a compound microscope areand 6 respectively. The magnifying power of this microscope is:

The magnifying power of an astronomical telescope is 8 and the distance between the two lenses iscm. The focal length of eye lens and objective lens will be respectively:

An optical instrument used for magnification has powerD of objective andD of eyepiece. Whether it is a microscope or a telescope?

The magnifying power of an astronomical telescope in normal adjustment isThe distance between the objective and the eyepiece iscm. The focal length of the objectives and eyepiece is

The power of a thin convex lens of glass is 5 D. When it is immersed in a liquid, then it behaves like a divergent lens of focal lengthcm. The refractive index of the liquid is:(Given, refractive index of glass = μ = 1.5)

A convex lens of refractive index 3/2 has a power of 2.5 D in air. If it is placed in a liquid of refractive index 2 then the new power of the lens is

A convex lens and a concave lens, each having the same focal length ofcm, are put in contact to form a combination of lenses. The power of the combination (in dioptres) is

The objective of a compound microscope is essentially:

If the focal length of the objective lens is increased then,

Finger prints are observed by the use of :

The eyepiece of an astronomical telescope has a focal length ofcm. The telescope is focused for normal vision of distant objects when the tube length is 1 m. The focal length of the objective is:

To increase the angular magnification of a simple microscope, one should increase:

The angular magnification of a system is less than one. Does it mean that the image formed is inverted?

Through my lenses, it is possible to see the colors and the beak’s size of some birds in the forest.Who am I?

Through my lenses, scientists were able to observe microorganisms and could develop the antibiotics that fight many diseases. Who am I?