Question

A point source whose intensity is 1 W/sr is located 25 cm from a 10-cm focal length lens with a 5-cm diameter. What is the image intensity? What is the irradiance at the center of a screen

(a) 10 cm from the lens in object space

(b) 25 cm from the lens in image space

(c) 10 cm from the lens in image space

Answer #1

An object is located 10 in. from a thin converging lens whose
focal length is 30 in. The image distance is approximately
____.

1. Consider a 1 mm bug located at your nearpoint, 25 cm away
from your left eye. 1a). Sketch the object, lens and image
positions if the object is 1 mm in size and the image distance
between the retina and lens in your eye is 1 cm. 1b). What focal
length for your eye lens is needed to focus the bug’s image onto
your retina? 1c). If you insert a convex magnifying glass 6 cm away
from the bug,...

A mirror with a focal point of -50 cm is located 1 m behind a
lens with a focal point
of 80 cm. An object is placed 1 m in front of the lens. Determine
the location of the
final image? Determine the total magnification and the
characteristic of the final
image.

A lens has a focal length of 15 cm. An object is located 8 cm
from the surface of the lens.
a. Calculate how far the image is from the lens.
b. Tell whether the image is real or virtual.
c. Calculate the magnification of the image (state whether the
image is erect or inverted).

A converging lens with focal length 10.0 cm is
located 28.0 cm to the left of a diverging lens
with focal length - 8.0 cm. An object is placed 36
cm to the left of the converging lens. Where is the final image
located relative to the diverging lens?
Select one:
a) at infinity
b) 13.9 cm to the right
c) 14.2 cm to the right
d) 5 cm to the left

1. If an object is inside the focal point of a concave mirror,
the (answer choices: image will be inverted, image will be real,
image distance will be greater than the object distance, or
magnification will be less than 1)?
2. A diverging lens has a of focal length of -58.5 cm. A real
object is placed 25.3 cm in front of the lens.
a.) What is the image distance?
b.) Which side of the lens is the image located...

1. If an object is inside the focal point of a concave mirror,
the (answer choices: image will be inverted, image will be real,
image distance will be greater than the object distance, or
magnification will be less than 1)?
2. A diverging lens has a of focal length of -58.5 cm. A real
object is placed 25.3 cm in front of the lens.
a.) What is the image distance?
b.) Which side of the lens is the image located...

A 3 cm. "tall" object is placed 25 cm. from a convex lens with a
focal length of 50 cm. Determine at what distance a focused image
will appear. Determine the height of this image. Create a sketch
(ray diagram) showing the scenario described above labeled as “A”
and a scenario where everything is the same except the focal length
of the lens is changed to 12.5 cm.

an
object 1 cm high is 15 cm from a convex lens of 10 cm focal length.
A) find the distance and size of the image graphically.
B) find the distance and size of the image
mathematically.

The tube length in a certain compound microscope is 25
cm. The focal length of the objective lens is 2.1 cm. The clearest
image is formed when an object of height 1 mm is placed at a
distance of 2.3 cm from the objective lens. Determine: (i) The
position of the intermediate image, (ii) the focal length of the
eye piece, that will place the final image at the near-point, (iii)
the total magnification of the microscope and the height...

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