CBSE Class 12-science Physics Optical Instruments
- 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.
- discuss about the qualitative Idea resolving power of astronomical telescope
- Draw a labelled ray diagram showing the course of rays in an astronomical telescope,when the final image is formed at least distance of distinct vision. Write mathematical expression for its magnifying power.By increasing the diameter of the objective of telescope, we can increase its range,why?
- Draw a labelled ray diagram of a reflecting type telescope. Write its any one advantage over refracting type telescope.
- An astronomical telescope, in normal adjustment position, has magnifying power 5. The distance between the objective and the eye-piece is 120 cm. Calculate the focal lengths of the objective and of the eye-piece.
- A compound microscope with an objective of 2 cm focal length and an eye-piece of 4 cm focal length has a tube length of 40 cm. Calculate the magnifying power of the microscope, if the final image is formed at infinity.
- Draw a ray diagram of an astronomical telescope in the normal adjustment position. Write down the expression for its magnifying power. State two drawbacks of this type of telescope.
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