From the data of four lenses given in `Q.4` which one will you select as objective of a compound microscope and which one as eye lens ? How can the magnifying power of such a microscope be increased ?

From the data of four lenses given in `Q.4` which one will you select

1.	From the data of four lenses given in `Q.4` which one will you select as objective of a compound microscope and which one as eye lens ? How can the magnifying power of such a microscope be increased ?
Answer» The objective of a compound microscope should have small focal length and small aperture. Therefore, lens `D` serves as the objective lens. For larger magnifying power, focal length of eye lens should be small (though greater than the focal length of objective lens). Therefore, lens `C` is selected as eye lens. Magnifying power, `m = (L)/(f_(0))(1 + (d)/(f_(e)))` `m = (L)/(5)(1 + (25)/(10)) = (7 L)/(10)` Clearly, `m` can be increased by increasing the length `L` of the microscope tube.

Discussion

No Comment Found

Related InterviewSolutions

Red light of wavelength `6500 Å` from a distant source falls on a slit `0.50 mm` wide. Calculate the distance between first two dark bands on each side of central bright band in the diffraction pattern observed on a screen placed `1.8 m` from the slit.
The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringe from the centre is
The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringe from the centre isA. `2`B. `1//2`C. `4`D. `16`
Among the two interfering monochromatic sources A and B, A is ahead of B in phase by `66^@`. If the observation be taken from point P, such that `PB-PA=lambda//4`. Then the phase difference between the waves from A and B reaching P isA. `156^(@)`B. `140^(@)`C. `136^(@)`D. `126^(@)`
The radius of curvature of curved surface of a thin plano-convex lens is `10 cm` and the refractive index is `1.5`. If the plano surface is silvered, then the focal length will be.A. 15 cmB. 20 cmC. 5 cmD. 10 cm
Calculate the resolving power of a microscope with cone angle of light falling on the objective equal to `60^(@)`. Take `lambda = 600 nm mu` for air `= 1`.
The diameter of the pupil of human eye is about `2 mm`. Human eye is most sensitive to the wavelength `555 nm`. Find the limit of resolution of human eye.
Assume that light of wavelength `6000 Å` is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inch ? (NCERT Solved example)
A central fringe of interference pattern produced by light of wavelength `6000 Å` is shifted to the position of 5th bright fringe by introducing thin film of `mu = 1.5`. Calculate thickness of the film.
Laser light of wavelength `630 nm` incident on a pair of slits produces an interference pattern where bright fringes are separated by `8.1 mm`. Another light produces the interference pattern, where the bright fringes are separated by `7.2 mm`. Calculate the wavelength of second light.

From the data of four lenses given in `Q.4` which one will you select as objective of a compound microscope and which one as eye lens ? How can the magnifying power of such a microscope be increased ?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment