Thin Lenses

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Questions

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• How are converging lenses different from diverging lenses?
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• If a concave and convex lens of equal focus are kept in contact what is the effective focal length?
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• A 2 cm tall object is placed 41 cm from a convex lens with a focal distance of 7 cm. The object is moved to 4cm from the same lens. How would you calculate the distance to the image from the lens, the magnification, and the height of the image?
• The object is moved to 4cm from the same lens. How would you calculate the distance to the image from the lens, the magnification, and the height of the image?
• A 5 cm tall object is placed 68 cm from a convex mirror with a focal distance of -4 cm. The object is moved to 1cm from the same mirror. How would you calculate the distance to the image from the lens, the magnification, and the height of the image?
• A 3cm tall object is placed 40cm from a concave mirror with a focal distance of 16cm. The object is moved to 10cm from the same mirror. How would you calculate the distance to the image from the lens, the magnification, and the height of the image?
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• A thin converging lens is used to focus the rays from the #Sun# on to the piece of paper. when the rays burn a hole on the paper, the distance between the lens and the paper is __________ the focal length of the lens. { options are;- } ??
• A converging lens is used to project a 250 mm image of a square slide onto a screen 1000 mm away. the focal length of the lens is 200 mm. by means of scale drawing, determine---(a) the distance of the slide from the lens----(b) the size of the slide???
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• If the focus of a concave lens is a virtual point, how can a ray appear to come from there? In other words, how can we view the image there?
• What is the optical axis?
• What are progessive lens?
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• When the lower half of a convex lens is covered with a black paper, will we be able to see the image? Why and how?
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• A person cannot read books placed nearer than #50"cm"# from their eyes. What type of lens should they use to correct this?
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• When an object is placed 8cm from a convex lens, an image is captured on a screen at 4com from the lens. Now the lens is moved along its principal axis while the object and the screen are kept fixed. Where the lens should be moved to obtain another clear?
• Combination of lenses.. can you solve it?
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• Geometrical Optics. Find the correct option(s)?
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• A convex lens of focal length 40cm is in contact with a concave lens of focal length 25cm . Calculate the power combination ?
• Which is correct ?
• The length of telescope is 100cm and magnification is 9 the focal length of objective and eyepiece is ? answer is 90cmamd 10cm but how?