Draw the ray-diagram for the formation of image by a refracting telescope having the final image formed at infinity Define the angular magnification and derive the formula for the same for image formed at infinity.
Important Questions on Optical Instruments
Derive the general relation for the magnifying power of an astronomical telescope when image is formed at infinity State any one advantage of an astronomical telescope of the reflecting type over a refracting type.
Draw a ray diagram to show how the image of a distant object is formed by a reflecting astronomical telescope when in normal use. State one advantage over a refracting-type telescope.
Draw a labelled ray diagram showing the formation of an image by a refracting telescope when the final image lies at infinity
What do you mean by the resolving power of a telescope? How does the resolving power of a telescope depend upon the wavelength of the light and the aperture of the objective lens?
Explain the statement; ‘Angular magnification of a compound microscope in normal use is .
With regard to an astronomical telescope of refracting type, state how will you increase its : (i) magnifying power (ii) resolving power.
