Convex Lens - Image Formation and Magnification
 1) For convex lens, incident light rays pass without deviation through Optical Centre Pole Focus Centre of curvature

 2) An object is placed vertically between F and 2F in front of a convex lens, then Image formed is virtual, diminished, and erect Image formed is real, diminished, and inverted Image formed is real, magnified, and inverted Image formed is virtual, magnified, and erect

 3) A convex lens of focal length 15cm, produces an image of the same size as that of an object. The distance between the position of image and object in this case is 15 cm 50 cm 60 cm 30 cm

 4) The focus of a convex lens is real and positive real and negative virtual and positive virtual and negative

 5) Effective magnification when two lenses are combined is M = M1 + M2 M = M1 x M2 M = (M1 + M2) / 2 M = M1 / M2

 6) For a convex lens of focal length 5cm, an object is placed at a distance of 4cm. The nature of the image formed is Real, inverted, and magnified Virtual, erect and diminished Virtual, inverted and magnified Virtual, erect, and magnified

 7) Are position of object and image interchangeable assuming an equiconvex lens Always possible Possible for virtual images only Possible for real images only Not possible

 8) When half of the convex lens is covered by paper, Partial Image formed No image is formed No change in the image formed The complete image is formed with less clarity

 9) The linear magnification produced by a convex lens is always less than 1 always greater than to one can be less than one, greater than one, or equal to one can be one, greater than one but not equal to one

 10) An object placed at infinity will be highly diminished and point sized in convex mirror, convex lens, concave mirror, and concave lens convex lens only concave and convex lenses only convex mirror only

 11) An object is 10cm away from a magnifying lens and its image is formed 20cm away from the lens. Magnification of the lens is 4 0.5 2 0.25

 12) A convex lens is not used To correct hypermetropia or long-sightedness To correct myopia or short-sightedness By watchmakers while repairing fine parts As a magnifying lens

 13) To obtain a clear image of a distant object Lens should have a small aperture much less than the radius of curvature The object should not be well illuminated The screen should be kept in a brightly lit area Convex lens should be thick

 14) An object placed at infinity will be highly diminished and point sized in convex mirror, convex lens, concave mirror, and concave lens convex lens only convex mirror only concave and convex lenses only

 15) Projectors are optical devices that project the magnified images or videos on the screen. To obtain an upright image on the projection screen Object is placed between optical centre and focus of the concave lens Film is always loaded upside down Object is placed between optical centre and focus of the convex lens Film is always loaded erect