An object is placed 80 cm from a converging lens of focal length 25 cm. What is the nature of the image?
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Where should an object be placed in front of a convex lens to get a real image of the size of the object?
(b) When an object is placed at the centre of curvature in front of a convex lens, its image is formed at the centre of curvature on the other side...
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An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image,
Given, u=-10 cm, f=+15 cm,v=? From mirror formula, 1/f=1/v+1/u or 1/v=1/f=1/u =1/v=1/15=1/(-10)=1/15+1/10=(2+3)/30 or v=30/5=+6 cm That is image is formed at a distance of 6 cm from the mirror behind it. The image is erect...
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Where should an object be placed in front of a convex lens to get a real image of the size of the object
For real image of same size, the object must be placed at the distance 2f in front of convex lens, choice (b) is correct.
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A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Given P=+ 1.5D As P=1/f (in metre) , Focal length, f =1/P=1/1.5=0.667m=66.7cm As power of prescribed lens is positive, the lens is converging (or convex) lens.
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It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens?
It is a convex lens. No, when the object is placed close to a convex lens then the image formed is virtual which cannot be obtained on screen.
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A point source of light is placed at a distance, of 2 f from a converging lens of focal length 1 The intensity on the othe
The correct answer is (c) 2 f EXPLANATION: The intensity of the light on the other side is maximum where the image of the point source is formed. Here u = -2f, f...
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A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,
(c) the image will not be shifted (d) the intensity of the image will decrease
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A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source
(a) must be less than 10 cm
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An illuminated object is placed on the principal axis of a converging lens so that a real image is formed on the other side of the lens. I
(b) the image will be shifted a little later than the object
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A converging lens is kept co-axially in contact with a diverging lens – both the lenses being of equal focal lengths.
Let focal length of converging and diverging lenses be + f and - f respectively. Power of converging len P1 = 1/f, Power of diverging lens P2 = - 1/f ∴ Power of combination P...
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