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Class 12
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Convex Lens - Image Formation and Magnification
Convex Lens - Image Formation and Magnification
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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