Convex Lens


Point 1: X = Y = slope = Point 2: X = Y = Focal Length = CM

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is:

1 real and larger than the object
2 real and the same size than the object
3 real and smaller than the object
4 virtual and the same size than the object
5 virtual and smaller than the object

An erect object placed outside the focal point of a converging lens will produce an image that is:

1 erect and virtual
2 inverted and virtual
3 erect and real
4 inverted and real
5 impossible to locate

Where must an object be placed in front of a converging lens in order to obtain a virtual image?

1 At the focal point
2 At twice the focal length
3 Greater than the focal length
4 Between the focal point and the lens
5 Between the focal length and twice the focal length

Let p denote the object-lens distance and i the image-lens distance. The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by:

1 p/I
2 i/p
3 f/p
4 f/I
5 i/f

An erect object is 2f in front of a converging lens of focal length f. The image is:

1 real, inverted, magniﬁed
2 real, erect, same size
3 real, inverted, same size
4 virtual, inverted, reduced
5 real, inverted, reduced

An object is in front of a converging lens,at a distance less than the focal length from the lens.Its image is:

1 virtual and larger than the object
2 real and smaller than the object
3 virtual and smaller than the object
4 real and larger than the object
5 virtual and the same size as the object

The term “virtual” as applied to an image made by a mirror means that the image:

1 is on the mirror surface
2 cannot be photographed by a camera
3 is in front of the mirror
4 is the same size as the object
5 cannot be shown directly on a screen

Which instrument uses a single converging lens with the object placed just inside the focal point?

1 Camera
2 Compound microscope
3 Magnifying glass
4 Overhead projector
5 Telescope

An object is placed at the focal point of a converging lens of focal length f. What is the image distance?

1 f
2 2f
3 1/f
4 2/f
5 at an infinite distance

Which one of the following statements is true concerning the focal length of a lens?

1 The focal length is the same for all colors.
2 The focal length is different for different colors because of reflection.
3 The focal length is different for different colors because of dispersion.
4 The focal length is different for different colors because of polarization.
5 The focal length is different for different colors because of spherical aberration.

An object is placed at the focal point of a thin diverging lens of focal length f. What is the image distance?

1 f
2 2f
3 1/f
4 f/2
5 at an infinite distance

A convex lens has a focal length f. An object is placed at a distance between f and 2f on a line perpendicular to the center of the lens. The image formed is located at what distance from the lens?

1 2f
2 between f and 2f
3 f
4 between the lens and f
5 farther than 2f

A convex lens has a focal length f. An object is placed between infinity and 2f from the lens along a line perpendicular to the center of the lens. The image is located at what distance from the lens?

1 farther than 2f
2 2f
3 between f and 2f
4 f
5 between the lens and f

An object is placed in front of a lens which forms an image of the object.

1 If the lens is convex, the image cannot be virtual.
2 If the image is real, then it is also inverted.
3 If the image is real, then it is also upright.
4 If the image is virtual, then it is also inverted.
5 If the image is virtual, the lens must be a diverging lens.

The purpose of prescription glasses for a near-sighted person is to bring distant objects

1 to the far point of the eye
2 to the near point of the eye
3 to the retina of the eye
4 none of the above

An object that is 18 cm from a converging lens forms a real image 22.5 cm from the lens. What is the magnification of the image?

1 1.25
2 0.80
3 0.80
4 1.25

The focal length of thin lens is given by

1 f = p+q
2 f = p.q
3 (1/f) = (1/p)+(1/q)
4 f = p-q

For a spherical mirror, the focal length is equal to ____ the radius of curvature of the mirror.

1 one-fourth
2 one-third
3 one-half
4 the square of

The magnification of thin lens is given by

1 M = p+q
2 M = (-q/p)
3 M = (1/p)+(1/q)
4 M = (-p/q)