Answer:
7.50 cm
Explanation:
The formula
1/v + 1/u = 1/f
Is used.
where.
u is the object distance.
v is the image distance.
f is the focal length of the lens.
1/v + 1/15 = 1/5
1/v = 1/5 - 1/15
1/v = (3-1)/15
1/v = 2/15
2v = 15
V = 15/2
V = 7.5 cm
For focal length, f in lens is always taken as negative for concave and positive for convex. ... And for image distance, V in lens it is taken as positive in Convex lens since image is formed on +X side. It is taken as negative in Concave lens since image is formed in -X side of the Cartesian.
Answer:
5 minutes
Explanation:
Let X, be the time to observe light for the 2-m
Therefore,
If it takes 4-m telescope 10 minutes
then ⇒ X × 4-m = 2-m × 10
X minutes = 20/4 = 5 minutes
time 5 minutes
A short focal length will give a wide field of view but the objects in the field of view will appear small. A longer focal length will produce a larger image and a shorter focal length will produce a smaller image. The eyepiece is then used, much like a microscope, to magnify that image.
It will take 4-m telescope more time to view because of it's larger image
Magnification
The magnification of an astronomical telescope changes with the eyepiece used. It is calculated by dividing the focal length of the telescope (usually marked on the optical tube) by the focal length of the eyepiece (both in millimeters). Thus:
TELESCOPE FOCAL LENGTH / OCULAR FOCAL LENGTH = MAGNIFICATION
For example, a telescope with a 1000mm focal length using a 10mm ocular is operating at 100x magnification (1000/10=100).
The motion symbolizes the cleansing of sin, it cleanses the sin of other people.Dobbins is respectful and even though he doesn't know what the gesture means, he does it with respect. There exists a language barrier between the monks and Dobbins but through the gesture he tries to give the meaning to their interaction.
exothermic
Explanation:
negative means it's losing energy