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Home » Physics » First Year » Chapter Ten - Optical Instruments

Chapter Ten – Optical Instruments

This chapter deals with the optical instruments,like magnifying glass,compound microscope and telescopes.study of optical fibers is also included in this chapter.

Minimum distance from the eye at which an object can be clear is called least distance of distinct vision.size of image to the size of object is called magnification.ability of an instrument to reveal the minor details of the object is called resolving power.simple microscope contains one convex lens.compound microscope contains two convex lens,objective lens of short focal length and eye-piece of medium focal length.to see distant objects telescope is used.spectrometer is used to study spectrum of light.

  • Q10.1: A converging lens of focal length 5 cm is used as a magnifying glass. If the neat point of the observer is 25cm and the lens is held close to the eye. Calculate (i) the distance of the object from the lens. (ii) the angular magnification. What is the angular magnification when the final …

  • Q 10.2: A telescope objective has focal length 96cm and diameter 12cm. Calculate the focal length and minimum diameter of a simple eye piece lens for use with the telescope, if the linear magnification required is 24 times and all the light transmitted by the objective from a distant point on the telescope axis is …

  • Q 10.3: A telescope is made up of an objective of focal length 20cm and an eye piece of 5cm, both are convex lenses. Find the angular magnification.

  • Q 10.4: A simple astronomical telescope in normal adjustment has an objective of focal length 100cm and an eye piece of focal length 5cm. (i) Where is the final image formed? (ii) Calculate the angular magnification.

  • Q 10.5: A point object is placed on the axis of 3.6cm from a thin convex lens of focal length 3cm. A second thin convex lens of focal length 16cm is placed coaxial with the first and 26cm from it on the side away from the object. Find the position of the final image produced …

  • Q 10.6: A compound microscope has lenses of focal length 1cm and 3cm. An object is placed 1.2cm from the object lens. If a virtual image is formed, 25 cm from the eye, calculate the separation of the lenses and the magnification of the instrument.

  • Q 10.7: Sodium light of wavelength 589nm is used to view an object under a microscope. If the aperture of the objective is 0.9cm, (i) find the limiting angle of resolution, (ii) using visible light of any wavelength, what is the maximum limit of resolution for this microscope.

  • Q 10.8: An astronomical telescope having magnifying power of 5 consist of two thin lenses 24cm apart. Find the focal lengths of the lenses.

  • Q 10.9: A glass light pipe in air will totally internally reflect a light ray if its angle of incidence is at least 39 degree. What is the minimum angle for total internal reflection if pipe is in water? (Refractive index of water = 1.33)

  • Q 10.10: The refractive index of the core and cladding of an optical fiber are 1.6 and 1.4 respectively. Calculate (i) the critical angle for the interface (ii) the maximum angle of incidence in the air, of a ray, which enters the fiber and is incident at the critical angle on the interface.

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