Problem 10.15. Two converging lenses are 25 cm part. Focal length of each is 10 cm. An object is placed in front of one lens at 50 cm. Find the distance between the object and the final image? Data Focal length of each lens f1= f2 =f =10cm Distance between le…
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physics numrical
Problem 10.10. An astronomical telescope of angular magnification 1000 has an objective of 15 m focal length. What is the focal length of the eye piece?
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Problem 10.9. A compound microscope has a 12 mm focal length objective and a 75 mm focal length eye piece, and the two lenses are mounted 200 mm apart. If the final image is 225 mm from the eye piece, what is the magnification produced? Data Focal length of o…
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Problem 10.8. Find the distance at which an object should be placed in front of a convex lens of focal length 10 cm to obtain an image of double its size? Data Focal length of lensf=10cm Image size =2× object size K/a magnificent m =2 To find.... Object dist…
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Problem 10.7. Moon light passes through a converging lens of focal length 19 cm, which is 20.5 cm from a second converging lens of focal length 2 cm. Where is the image of the moon produced by the lens combination? Data Focal length of first lens f1 =19cm Foc…
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Problem 10.6. Two lenses are in contact, a converging one of focal length 30cm and a diverging one of focal length 10cm. What is the focal length and power of the combination? Data Focal length of first lens.f1 =30cm Focal length of 2nd lens f2 = -10cm To fi…
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Problem 10.5. A parallel light beam is diverged by a concave lens of focal length -12.5cm and then made parallel once more by a convex lens of focal length 50cm. How far are the two lenses apart. Data Focal length of first lens.f1 = -12.5cm Focal length of 2…
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Problem 10.4. A converging lens of focal length 20 cm is placed in front of a converging lens of focal length 4 cm. What is the distance between the lenses if parallel rays entering the first lens leave the second lens as parallel rays? Data Focal length of …
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Problem 10.3. Two converging lenses of focal lengths 40 cm and 50 cm are placed in contact. What is the focal length of this lens combination? What is the power of the combination in diopters? Data . Focal length of first lens.f1 =40cm Focal length of 2nd len…
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Problem 10.2. A convex lens has a focal length of 10 cm. Determine the image distances when an object is placed at the following distances from the lens. (50 cm, 20 cm, 15 cm, 10 cm and 5 cm). . A convex lens has a focal length of 10 cm. Determine the image d…
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Problem 9.6. If a diffraction grating produced a 1st order spectrum of light of wavelength 6 x 10^-7m at an angle of 20° from the normal. What is its spacing and also calculate the number of lines per mm?
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Problem 9.3. Interference fringes were produced by two slits 0.25 mm apart on a screen 150 mm from the slits. If eight fringes occupy 2.62 mm. What is the wavelength of the light producing the fringes?
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Problem 7.8. A rocket of mass 0.200 kg is launched from rest. It reaches a point p lying at a height 30.0 m above the surface of the earth from the starting point. In the process + 425 J of work is done on the rocket by the burning chemical propellant. Ignori…
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Problem 7.7. A body of mass ‘m’ accelerates uniformly from rest to a speed Vy in time ty. Show that the work done on the body as a function of time ‘t’, in terms of Vy and ty, is 1/2m(Vf2/tf2)t2.
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Problem 7.6. A horse pulls a cart horizontally with a force of 40 Ib at an angle 30° above the horizontal and moves along at a speed of 6.0 miles/hr. (a) How much work does the horse do in 10 minutes? (b) What is the power out put of the horse?
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Problem 7.5. A pump is needed to lift water through a height of 2.5 m at the rate of 500 g/min. What must the minimum horse power of the pump be?
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Problem 7.4. When an object is thrown upward, it rises to a height ‘h’. How high is the object, in terms of h, when it has lost one-third of its original kinetic energy?
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19. Two blocks each weighing 196N rest on planes as shown in fig. 3.24. If the planes and pulleys are frictionless, find the acceleration and tension in the cord.
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