Question

# Two convex lenses, of equal focal length but of aperture A1 and A2 (A1> A2) are used as the objective lenses in two astronomical telescopes have indentical eye-piece  Compare the ratio of their  I) Resolving Power II) Normal magnifying power III) Intensity of the image formed by them Which of the telescopes should be preferred? Why?

Solution

## Resolving power = 1.22 * (wavelength/ diameter) so telescope has higher aperture will have less resolving power So resolving power of second telescope A is high.  Focal length is same so magnification will be same.  Both has same magnification.  Intensity is proportional to square of diameter so A has higher aperture so intensity of image formd by A1 is considered. Physics

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