Where should a candle be placed so that an image will appear on a screen if a converging lens (f=12.14cm) is placed 20 cm in front of the screen?
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- A converging lens (f = 11.2 cm) is held 8.05 cm in front of a newspaper, the print size of which has a height of 2.20 mm. (a) Find the image distance (in cm), (b) The height (in mm) of the magnified print.A candle is placed at a distance of 30.0 cm from a converging lens having a strength of 12.5 D. Determine the di and M ? Is the image upright or inverted?Assume that the near point of a hyperopic (farsighted) eye is 0.936 m in front of the eye. A lens is used to let the eye see clearly an object that is 0.250 m in front of the eye. Ignore the small distance from the lens to the eye. What is the power of the lens (in diopters; answer sign and magnitude)?
- An object is located 15.8 cm to the left of a diverging lens having a focal length f = −36.2 cm. (a) Determine the location of the image. distance cm location ---Select--- to the right of the lens to the left of the lens (b) Determine the magnification of the image.(c) Construct a ray diagram for this arrangement.The focal length of the lens of a simple digital camera is 40 mm, and it is originallyfocused on a person 25 m away. In what direction must the lens be moved tochange the focus of the camera to a person 4.0 m away?A diverging lens (f=-12.0 cm) is located 22.0 cm to the left of a converging lens (f=34.0 cm). A 3.70 cm tall object stands to the left of the diverging lens, exactly at its focal point. (a) Determine the distance of the final image relative to the converging lens. (b) What is the height of the final image (including the proper algebraic sign)?
- What is the focal length of the lens in your eye when you can focus on an object at your near point? Assume that the distance from your lens to the back of your eye is 2.0 cm, that your near point is 21 cm in front of your lens, and that the liquid behind the lens has n=1.00 just like the air in front of your lens. (a) 1.8 cm (b) 18 cm (c) 2.1 cm (d) 21 cm (e) None of the above.not a graded assignmentA converging lens of focal length 20 cm is placed 30 cm in front of another converging lens of focal length 4.0 cm. An object is placed 100 cm in front of the first lens. Determine(a) the location of the final image, (b) its orientation, and (c)whether it is real or virtual.
- A nearsighted person has a far point of 25.3cm and is prescribed contact lenses to correct her vision. What lens strength (a.k.a., lens power), in Diopters, should be prescribed? Give your answer using the usual convention of positive values for converging lenses and negative values for diverging lenses.If you want to examine the fine detail of an object with a magnifying glass with a power of +20.0 diopters, where should the object be placed so as to observe a magnified image of the object?