It is an optical instrument used to see very small bodies. Its magnifying energy is provided by
![2251_Optical instruments.png](https://www.expertsmind.com/../CMSImages/2251_Optical instruments.png)
Simple microscope
(i) It is a one convex lens of smaller focal length.
(ii) Also known as reading lens or magnifying glass.
(iii) Magnification's, when final image is formed at
![1639_Optical instruments1.png](https://www.expertsmind.com/../CMSImages/1639_Optical instruments1.png)
|
![2048_Optical instruments2.png](https://www.expertsmind.com/../CMSImages/2048_Optical instruments2.png)
|
(iv) If lens is placed at a distance a from the eye then ![568_Optical instruments3.png](https://www.expertsmind.com/../CMSImages/568_Optical instruments3.png)
Compound microscope
(i) Having of two converging lenses called objective and eye lens.
(ii) feye lence > fobjective
and (diameter)eye lence > (diameter)objective
(iii) Intermediate picture is actual and enlarged.
(iv) Final picture is virtual, magnified and inverted.
|
![1088_Optical instruments4.png](https://www.expertsmind.com/../CMSImages/1088_Optical instruments4.png)
|
(v) uo= Distance of object from objective(o), vo = Distance of image (A'B') formed by objective from objective, ue = Distance of A'B' from eye lens, ve = Distance of final image from eye lens, fo = Focal length of objective, fe = Focal length of eye lens.
(vi) Final image is formed at ∞: Magnification
and length of the microscope tube (distance between two lenses) is LD = uo + ve .
Generally object is placed very near to the principal focus of the objective hence uo≡fo . The eye piece is also of small focal length and the image formed by the objective is also near to the eye piece.
So vo≡ LD , the length of the tube.
Hence, we can write ![1122_Optical instruments6.png](https://www.expertsmind.com/../CMSImages/1122_Optical instruments6.png)
(vii) Final image is formed at : magnification
and length of tube L∞ = vo + fe
In terms of length ![616_Optical instruments8.png](https://www.expertsmind.com/CMSImages/616_Optical%20instruments8.png)
(viii) For larger magnification of the compound microscope, both f0 and fe should be small.
(ix) If the size of the tube of microscope increases, then its magnifying power increases.
(x) The magnifying energy of the compound microscope may be expressed as M = mo * me ; where me is the magnification of the objective and me is magnifying power of eye piece.
Email based Physics assignment help - homework help at Expertsmind
Are you searching physics expert for help with Optical instruments questions? Optical instruments topic is not easier to learn without external help? We at www.expertsmind.com offer finest service of Physics assignment help and physics homework help. Live tutors are available for 24x7 hours helping students in their Optical instruments related problems. We provide step by step Optical instruments question's answers with 100% plagiarism free content. We prepare quality content and notes for Optical instruments topic under physics theory and study material. These are avail for subscribed users and they can get advantages anytime.
Why Expertsmind for assignment help
- Higher degree holder and experienced experts network
- Punctuality and responsibility of work
- Quality solution with 100% plagiarism free answers
- Time on Delivery
- Privacy of information and details
- Excellence in solving physics queries in excels and word format.
- Best tutoring assistance 24x7 hours