define resolving power of compound microscope .how does the resolving power of a compound change when-a refractive index of medium between the object and objective lens increases b wavelength of the light used is increased c decreasing the diameter of objective d increasing the focal length of its objective
Asked by mahamood.iphone | 21st Dec, 2015, 10:34: AM
The resolving power of a compound microscope can be defined as the ability of the microscope to form separate images of two objects placed very close to each other.
The minimum separation between two objects that are to be resolved by a microscope is given as
Now, the resolving power of microscope is the reciprocal of the minimum distance.
Therefore, we have
Therefore, from the above expression we can see that
(a) When refractive index of medium increases.
As the R.P is directly proportional to the refractive index (n), it increases when n increases.
(b) When wavelength of light used increases.
As the R.P is inversely proportional to the wavelength (λ), it decreases when λ increases.
(c) When diameter of objective lens increases.
When diameter of objective is increased, θ increases. Hence, sinθ also increases.
As the R.P is directly proportional to the sinθ, it increases when diameter of objective increases.
(d) When focal length of objective lens increases.
As the R.P is independent of focal length of the lens, it remains unchanged when focal length increases.
Answered by Romal Bhansali | 21st Dec, 2015, 01:57: PM
- derive the expression for the magnifying Power and the length of a compound microscope using two convex lenses.
- derive an expression for the magnifying power of an astronomical telescope in normal adjustment?
- Define and write expression for magnifying power of an astronomical telescope in normal adjustment (i,e, when the final image is formed at infinity)
- Find the maximum magnifying power of a compound microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm.
- the magniuifying power of a telescope is 9. when it adjusted for parallel rays the didtance b/w the eye piece and objective lens is 20cm find the focal length of both lenses
- which mirror does used in microscope and why?
- Is combination of a mirror and lens in syllabus of class 12?
- astronomical telesccope with full explaination
- A compound microscope consists of an objective of focal length 1 cm and eye piece of focal length 5 c separated by 12.2 cm. At what distance from the objective should an object be placed so that the final image is formed at least distance of distinct vision?
- A convex lens of focal length 15 cm is placed in front of a convex mirror. Both are coaxial and the lens is 5 cm from the apex of the mirror. When an object is placed on the axis at a distance of 20 cm from the lens ,it is found that the image coincides with the object. Calculate the radius of curvature of the mirror.
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number